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[原创]GMATPrep 数学讨论题库汇总
1.h(n)是一个从2开始一直到n的偶数的乘积，p是h(100)+1最小的prime factor ,求p的范围，答案是大于40，为什么呢？这道题该怎么做？2. In the xy-plane, at what two points does the graph of y=(x+a)(x+b) interest the x-axis?（1）a+b= -1(2)The graph intersects the y-axis at (0,-6)3.&&If 500 is the multiple of 100 that is closest to X and 400 is the multiple of 100 that is closest to Y, which multiple of 100 is closest to X+Y?(1)X&500(2)Y&4004. If set S consist of the numbers 1, 5, -2, 8, and n, is 0&n&7?(1)the median of the numbers in S is less than 5.(2)the median of the numbers in S is greater than 1. 5.PS：if xy=1, what is the value of 2(x+y)^2/2(x-y)^2choices: 2,4,8,16,32Key:166. if xy=1, what is the value of 2(x+y)^2/2(x-y)^2.A. 2&&B. 4&&C.8&&D. 16&&E. 32&&答案：D7.&&List K consists of 12 consecutive integers, if -4 is the least integer in list K, what is the range of the positive integers in the list K ?A. 5 B.6 C.7 D.11 E.12 答案：B8. if w,x,y and z are integers such that w/x and y/z are integers, is w/x+y/z odd?(1)wx+yz is odd(2)wz+xy is odd 9. is the three-digit number n less than 550?(1)the product of the digits in n is 30(2)the sum of the digits in n is 1010. On a certain day, Tim invest $1,000 at 10 percent annual interest, compound annually, and Lana invested $ 2,000 at 5 percent annual interest, compound annually. The total amount of interest earned by Tim’s investment in the first 2 years was how much greater than the total amount of interest earned by Lana’s investment in the first 2 years?5,15,50,100,105答案是A 11.If xy=1, what is the value of 2(X+Y)^2比上2(X-Y))^2?答案是16 12. If m,r,x and y are positive, is the ratio of the m to r equal to the ratio of x to y?1)& && &the ratio of m to y is equal to the ratio of x to r2)& && &the ratio of m+x to r+y is equal to the ratio of x to y答案是B 13. if xy=1, what is the value of 2(x+y)2/2(x-y)2?answer: 16 14. At least 100 students at a certain high school study Japanese. If 4 percent of the students who study French also study Japanese, do more students at the school study French than Japanese?1)16 students at the school study both French and Japanese.2)10 percent of the students at the school who study Japanese also study French.answer: 2) is sufficient, but 1) is not. 15.If it took Carol 1/2 hour to cycle from his house to the library yesterday, was the distance that he cycled greater then 6 miles? ( 1mile=5,280feet)1)& && &The average speed at which Carlos cycled from his house to the library yesterday was greater than 16 feet per second.2)& && &The average speed at which Carlos cycled from his house to the library yesterday was less than 18 feet per second答案是E16.In the figure above, equilateral triangle ABC is inscribed in the circle. If the length of arc ABC is 24, what is the approximate diameter of the circle?5,8,11,15,1917.Is M+Z&oA: M-3Z&oB: 4Z-M&o答案是C。 18. If X^4+Y^4=100, then the greatest possible value of X is between:0 and 33 and 66 and 99 and 1212 and 1519. Is 2X-3Y& X^2?A: 2X-3Y=-2B: X&2 and Y&0答案为D 20. DS, in a work force, the empolyees are either managers or directors. What is the percentage of directors? a) the average salary for manager is $5,000 less than the total average salaryb) the average salary for directors is $15,000 more than the total average salaryanswer is C) 21. DS: if the integer a and n are greater than 1, and the product of the first 8 positive interger is a multiple of a^n, what is the value of a? a) a^n = 64b) n = 6,answer is b22. xy=1, what is the value of 2(x^2 + y^2) / 2(x^2 - y^2) = ?a) 2b) 4c) 8d) 16e) 32 23. A hiker walking at a constant rate of 4 miles per hour is passed by a cyclist traveling in the same direction along the same path at a constant rate of 20 miles per hour. The cyclist stops to wait for the hiker 5 minutes after passing her, while the hiker continue to walk at her constant rate. How many minutes must the cyclist wait until the hiker catches up?答案为20 24. if x and y are positive integers, is the product xy even?1) 5x-4y is even2) 6x+7y is even.答案d 25. X, Y为integers,问X(Y+1)是否为even number?(1)& &X, Y各为prime number(2)& &Y&7Ans: C 26. 500 is the multiple of 100 that is closest to X and 400 is the multiple of 100 that is closest to Y, which multiple of 100 is closest to X+Y？<O></O>(1)& &X&500<O></O>(2)& &Y&400Ans：E 27. If d is positive integer, f is the product of the first 30 positive integers, what is the value of d?<O></O>(1)& &10^d is a factor of f<O></O>(2)& &D&6Ans ：C 28.&&Set S consists of five consecutive integers, and set T consists of seven consecutive integers. Is the median of the numbers in set S equal to the median of the numbers in set T?(1)& & The median of the numbers in set S is 0.(2)& & The sum of the numbers in set S is equal to the sum of the numbers in set T.所给答案是C 29. A computer chip manufacturer expects the ratio of the number of defective chips to the total number of chips in all future shipments to equal the corresponding ratio for shipments S1, S2, S3 and S4 combined, as shown in the following table. What is the expected number of defective chips in a shipment of 60,000 chips?<O></O>ShipmentNumber of defective chips in the shipmentTotal number of chips in the shipmentS125,000S2512,000S3618,000S4416,000a)14& &b)20& &c)22& &d)24& &e)25所给答案是b. 30 . is X4+Y4&Z4(1) X2+Y2&Z2(2) X+Y&Z答案是E 31. At a certain bookstore, each notepad costs x dollars and each markers costs y dollars. If $10 is enough to buy 5 notepads and 3 markers, is $10 enough to buy 4 notepads and 4 markers instead?(1) each notepad cost less than $1(2) $10 is enough to buy 11 notepads答案是E 32. stock& && && &number of sharesv& && && && && &&&68w& && && && && & 112x& && && && && && & 56y& && && && && && &94z& && && && && && &45The table shows the number of shares of each of the 5 stocks owned by Mr. Sami. If Mr Sami was to sell 20 shares of Stock X and buy 24 shares of stock y, what would be the increase in range of the number of shares of the 5 stocks owned by Mr Sami?A 4& &B 6 &&C9&&D15& &E 20Answer: D 33.&&9.4, 9.9, 9.9, 9.9, 10.0, 10.2, 10.2, 10.5the mean and the standard deviation of the 8 numbers shown are 10 and 0.3, respectively. what persentage of the 8 number's are within 1 standard deviation?A) 90% B) 85% C) 80% D) 75% E) 70%答案是D 34. 一个公司， 800人， 70％服务10年以上， 如果这些人中有y个人退休， 也没新人加入； 那当y是多少的时候，可以使服务10年以上的人的比例为60％。我： 80， 800×（70％－60％）答案200 35. if X=/=-y, is (x-y)/(x+y) &1? 1) x&0, 2) y&0. 我选C， 答案居然是E， 我很ft 36. For all positve integers m, (m) = 3m when m is odd and (m) =1/2m when m is even, which of the following is equivalent to (9) X (6)Answers : 81 , 54, 36, 27 ,18I chose 81.. But answer says 27... I don't think the answer is right... Can anyone confirm? 37. For every positive even integer n, h(n) is defined as the product of all even number from 2 to n, inclusive. If p is the smallest prime factor of h(100)+1, then p isbetween 2 and 10 between 10 and 20 between 20 and 30 between 30 and 40 greater than 40key: E 同上46. For every positive even integer n, h(n)=2*4*6*…*n, if p is the smallest prime factor of h(100)+1,then p is？key: greater than 40 38. is the integer n odd?1) n is divisible by 32) 2n is divisible by twice as many positive integers as n2的意思不是很明白.答案是b 39.<FONT color=#, 75,80,85,90,105,105,130,130.130the list shown consists of the times, in seconds, that i took each of 10 schoolchildren to run a distance of 400 on of meters. if the stardard deviatiation of the 10 running times is 22.4 seconds, rouned to the nearest tenth of a second, how many of the 10 running times are more than 1 standard deviation below the mean of the 10 running times?a) one b) two c) three d) four e )five答案是b 40. XY+Z=X(Y+Z)Answer: X=1 or Z=0 41. For a finite sequence of nonzero numbers, the number of variations in&&sign is defined as the number of pairs of consecutive terms of the two sequence for which the product of the two consecutive terms is negative. What is the number of variations is in sign for the sequence.&&1, -3, 2, 5, -4, -6Answer:3個 42. For which of the following function f is f(x)=f(1-x)Answer: f(x)=x^2(1-x)^2 43. Does the integer k have a factor p such that 1&p&k?1)& && &k&4!2)& && &13！+2&= k&=13!+13 key: (B) 44. If xy = 1, what is value of 2(x+y)^2/2(x-y)^2Choices: 2, 4, 8, 16, 32 &&45. is m+z&0(1) m-3Z&0(2) 4z-m&0key:C (1) and (2) together enough, each alone is not enough 47. If x and y are integers greater than 1, is x a multiple of y?1) 3y^2+7y=x2) x^2-x is a multiple of ykey: A 48. On Jane's credit card account, the average daily balance for a 30-day billing cylce is average(arithmetic mean) of the daily balances at the end of the 30 days. At the begining of a certain 30-day billing cycle, Jane's credit card account had a balance of $600. Jane made a payment of $300 on the account during the billing cycle. If no other amounts were added to or substracted from the account during the billing cycle, what was average daily balance on Jane's account for the billing cycle?1) Jane's payment was credited on the 21st day of the billing cyle.2) The average daily balance through the 25th day of the billing cycle was $540.答案是D, each statement ALONE is sufficient. 49. Does the integer k have a factor p such that 1&p&k?(1) k&4!(2) 13!+2&=k&=13!+13答案是B。 50. stationery store,A costs X dollars,B costs Y dollars, if $10 is enough to buy 5 A and 3 B, IF $10 is enough to buy 4A and 4B?A.&&A costs less than $1B& & $10 is enough to buy 11 A. 51. 2 The temperatures in degress celsius recorede at 6 in the morning in various parts of a certain country were 10,5,-2,-1,-5 and 15What is the median of these temperatures? （这题我看不懂）A&&-2B&&-1C& &2D& &3E&&5 52. If 500 is the multiple of 100 that is closest to X and 400 is the multiple of 100 that is closest to Y , which multiple of 100 is closest to X +Y (1)& & X 小于500 (2)& & Y 小于 400这题什么意思阿? 53. 有4封信和4个写了正确地址的信封，如把这4封信随机放入那4个信封里，求只有一个信放对了信封的概率？ 54. The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of the chemical B present . If the concentration of chemical B is increased by 100 persent, which of the following is closest to the percent change in the concentration of chemical of A required to keep the reaction rate unchanged?& & A 100% increaseB 50% decreaseC&&40% decreaseD&&40 % increaseE&&50% increase 55. A certain stock exchange designates each stock with a one- , two-,or three-letter code ,where each letter is selected from the 26 letters of the alphabet. If the letter may be reapeated and if the same letters used in a different order constitute a different code , how many different stocks is it possible to uniquely designate with these codes? A&&2951B 8125C 15600D&&15302& && && && &&&E 18278& && &56. A store purchase 20 coats that each cost an equal amount and then sold each of the 20 coats at a euqal price , what was the store's gross profit on the 20 coats ?1).If the selling price per coat had been twice as much , the store's gross profit on the 20 coats would have been 24002) If the store selling price per coat had been $2 more ,the store's gross profit on the 20 coats would have been 440这道题偶觉得应该是C， 可答案是B。 57. Which of the following lists the number of points at which a circle can intersect a triangle?A. 2, 6 only B. 2,4,6 only C. 1,2,3,6 only D. 1,2,3,4,6 onlyE. 1,2,3,4,5,6.这道题什么意思啊？？ 58. For every positive even integer n, the function h(n) is defined to be the product of all the even integers form 2 to n, inclusive, if p is the smallest prime factor of h(100)+1, then p is a) between 2 and 10b) between 10 and 20c) between 20 and 30d) between 30 and 40e) greater than 40&&59. Last month 15 homes were sold in town x, the average sale price of the homes was $150000 and the median sale price was $130000, which of the following statement must be true.1) at least one of the homes was sold for more than $1650002) at least one of the homes was sold for more than $130000 and less than $1500003) at least one of the homes was sold for less than $130000.a) only 1 b) only 2c) only 3d) 1 and 2e) 1 and 3我觉得既然中数是130000，那一定有比它小的数，选c。但答案是a，不知道怎么得到的？ 60. At a dinner party, 5 people are to be seated around a circular table, two seating arrangments are considered differently only when the positions of the people are different relative to each other. what is the total number of different possible seating arrangments for the group.a) 5b)10c)24d) 32e) 120题目理解有问题，圆桌是不是要考虑？答案24 ，看样子是2P33 *P22, 这样的话跟圆桌没什么关系？ 61. Before being simplified, the instructions for computing income taxin Country R were to add 2 percent of one's annual income to theaverage(arithmetic mean) of 100 units of Country R's currency and 1percent of one's annual income. Which of the following represents thesimplified formula for computing the income tax, in Country R'scurrency, for a person in that country whose annual income is A?a. 50+A/200b. 50+3A/100c. 50+A/40d. 100+A/50e. 100+3A/100 62. For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100)+1, then p isbetween 2 and 10 between 10 and 20 between 20 and 30 between 30 and 40 greater than 40Key:E 63. Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one’s annual income to the average (arithmetic mean) of 100 units of Country R’s currency and 1 percent of one’s annual income. Which of the following represents the simplified formula for computing the income tax, in Country R’s currency, for a person in that country whose annual income is I?50+I/200 50+3I/100 50+I/40 100+I/50 100+3I/100Key: C 64. Each employee of Company Z is an employee of either Division X or Division Y, but not both. If each division has some part-time employees, is the ratio of the number of full-time employees to the number of part-time employees greater for Division X than for Company Z? (1)& &The ratio of the number of full-time employees to the number of part-time employees is less for Division Y than for Company Z.(2)& &More than half the full-time employees of Company Z are employees of Division X, and more than half of the part-time employees of Company Z are employees of Division Y.Key: D 65. Of the 60 animals on a certain farm, 2/3 are either pigs or cows. How many of the animals are cows?(1)& &the farm has more than twice as many cows at it has pigs.(2)& &The farm has more than 12 pigsKey: C 66. For every positive even integers n , the function h(n) is defined to be the product of all even integers from 2 to n inclusive .I f p is the smallest prime factor of h(100)+1, then p is greater than 40.(请教思路）
A student worked for 20 days .For each of the amounts shown in the first row of the table , the second row gives the number of days that the students earned that amount.What is the median amount of&&money&&that the student&&earned per day for the 20 days .Amount earned per day : $96&&$84&&$80&&$70&&$48Number of days :& && && && &&&4& &&&7& && &&&4& && & 3& &&&2（请教思路） 67. If x^4+y^4=100,then the greatest possible value of x is between 3 and 6.(请教思路）
F or which of&&the following fuctions is f(a+b)=f(a)+f(b) for all positive numbers a and b? (1) f(x)=x^2 (2) f(x)=x+1 (3)f(X)=根号向（4）f(x)=2/x (5)f(x)=-3x9请教思路 68 I f xy= 1, what the value of 2(X+Y)^2/2(X-y)^2.(请教思路） 69. If 500 is the multiple of 100 that is closet to x and 400 is the multiple of 100 that is closet to y, which multiple of 100 is closet to x+y?(1)x&500(2)y&400麻烦大家讲解一下。多谢！！！ 70. The numbers of books read by 7 students last year were 10, 5, p,. q, r, 29 and 20. What&&was the range of the numbers of books read by the 7 students last year?(1)5&p&q (2)p&r&15麻烦那位讲解一下。 71. A certain list consists of several different integers .Is the product of all the integers in the list positive?(1) The product of the greatest and the smallest of the integers in the list&&is positive.(2)There is even number of integers in the list.我选E 72. On a certain day, Tim invest $1,000 at 10 percent annual interest, compound annually, and Lana invested $ 2,000 at 5 percent annual interest, compound annually. The total amount of interest earned by Tim’s investment in the first 2 years was how much greater than the total amount of interest earned by Lana’s investment in the first 2 years?5,15,50,100,105答案是A 73. If xy=1, what is the value of 2(X+Y)^2比上2(X-Y))^2?答案是16，我不会做：（：（ 74. If m,r,x and y are positive, is the ratio of the m to r equal to the ratio of x to y?1)& && &the ratio of m to y is equal to the ratio of x to r2)& && &the ratio of m+x to r+y is equal to the ratio of x to y答案是B 75. a certain jar contains only B black marbles, W white marbles, and R red marbles, if one marble is to be chosen at random from the jar, is the probability that the marble chosen will be red greater than the probability that marble chosen will be white? 1, r/(B+W)& w/(B+R)2, B-W & Rkey:A 76. Q2, 2+2+2^2+2^3+2^4+…..+2^8=?Key: 2^9 77.If X & Y^2 & Z^4 , which of the following statements could be true?I. X & Y & ZII. Z & Y & XIII. X & Z & YA. I onlyB. I and II onlyC. I and III onlyD. II and III onlyE. I , II , and IIIkey:E78.Score& && && && & NumberInterval& && &&&of Scores50-59& && && && && & 260-69& && && && && &1070-79& && && && && &1680-89& && && && && &2790-99& && && && && &18The table above shows the distribution of test scores for a group of management trainees, Which score interval contains the median of the 73 scores?A. 60-69B. 70-79C. 80-89D. 90-99E. It cannot be determined from the information givenkey:C79.If each term in the sum a1 + a2 + a3 + ... +an is either 7 or 77 and the sum is equal to 350, which of the following&&could equal to n?38&&39&&40&&41&&42key:c 80.If n & m are positve integers, what is the remainder when 34n+2 is divided by 10?(1) n=2& &(2) m =1The answer is B81. If the terms of a sequence are t1, t2, t3, ... tn, what is n:(1) sum of n terms is 3,124& & (2) average of the n term is 4The correct answer is C 82.[attachimg]44713[/attachimg]83.The integers m and p such that 2&m&p and m is not a factor of p.& &If r is the remainder when p is divided by m, is r&1?1)the greated common factor of m and p is 22)the least common multiple of m and p is 30answer : A84.A certain libary assesss fines for overdue books as follows. On the first day that a book is overdue, the total fine is $0.10. For each additional day that the book is overdue the total fine is etiher increased by $0.30 ro double. whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue?A $0.60& && && & B $0.70& && &&&C $0.80& && && && &D $0.90& && && &E $1.00 (answer: B)
85.A certain city with population of132,000 is to be devided into 11 voting districts, and no district is to have population that is more than 10 percent greater than the population of any other district. What is the minimum possible population that the least population district could have?A 10700& & B 10800& & C 10900& &&&D 11000& &&&E 11100& & (answer: D) 86. If xy +z =x(y+z), which of the following must be true?A x=0 and z=0B x=1 and y=1C y=1 and z=0D x=1 or y=0E x=1 or z=0& &(answer: E)
87.On a certain tour bus, the ratio of the number of women and the number of childern is 5:2, what is the number of men?<FONT color=#)&&Children: men = 5:11<FONT color=#)&&women less than 30& &(answer: C)88. L spend total $6.00 for one kind of D and one kind of C.Hany D did he buy?1) the price of 2D was $0.10 less than the price of 3C2) the average price of 1 D and 1 C was $0.35answer: E&&89.Is X+Y &11) x &8/9& & 2) Y &1/8& & answer:E& & 90.If c and d are integers, is C even?1) c(d+1) is even& & 2) (c+2)(d+4) is even& &answer C& &91. 8本杂志，4本是Fashion，4本是Sports，随即且不放回的拿三本，其中至少有一本是Fashion的概率是多少？A 1／2& &&&B&&2／3& &&&C32／35& &&&D11／12& & E 13／14& & answer : E 92. [attachimg]44944[/attachimg]
93. the function f is defined for all positive integers n by the following rule. f(n) is the number of positive integers each of which is less than n and has no positive factor in common with n other than 1. If p is any prime number then f(p)=A p-1& & B p-2& &C (p+1)/2& &D (p-1)/2& & E 2& &answer:A94. 一个数列｛－10，－6，－5，－4，－2.5，－1，0，2.5，4，6，7，10｝，任取一个数，使得(x-5)(x+10)(2x-5)=0成立的概率是多少？A 1/12& &&&B 1/6& &&&C 1/4& &&&D 1/3& && & E 1/2& &answer: B95.&&R bought two kind of candy bars, C and T, that came in packages of 2 bars each. He handed out 2/3 of C bars and 3/5 of the T bars. Howmany packages of C bars did R buy?1) R bought 1 fewer package of C bars than T bars2) R handed out the same number of each kind of candy barsanswer: C
96. If the interger n is greater than 1, is n equal to 2?(1) n has exactly two positive facotrs(2) the difference of any two distinct positive factors of n is odd答案选B
本贴27楼97. Which of the following lists of points which a circle can intersect a triangle?A 2&6B 2,4&6C 1,2,3&6D 1,2,3,4&6E 1,2,3,4,5&6选E
98. How many odd integers are greater than the integer x and less than the integer y?(1)& &There are 12 even integers greater than x and less than y.(2)& &There are 24 integers greater than x and less than y.answer is B
本贴31楼99. [attachimg]45032[/attachimg]100.[attachimg]45033[/attachimg]
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101. Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?(1)& & two of the interior angles of ABCD are right angles(2)& & the degree measure of angle ABC is twice the degree measure of angle BCD答案选E 本贴38楼102. *代表加或减或乘或除,问何时(6*2)*4=6*(2*4)1), 3*2&32)3*1=3答案是A <FONT color=#ff.硬币连丢3次,请问2次朝上的概率是?答案是0.375,为什么不是0.125呢?<FONT color=#ff.有红车R辆,白车W辆,黑车B辆,请问随便选1辆,红车的概率是否比白车的大?1),R/(B+W)&W/(B+r)2),B-W&R答案是A,可是我不明白<FONT color=#ff.100个数据平均数是6,标准差是D,D是正数.请问加入哪2个数据,这102个数据的标准差会小于D?A,-6和0B,0和0C,0和6D,0和12E,6和6答案是E,我头晕,不明白了.<FONT color=#ff.正整数X和Y,请问XY是否是8的倍数1),X和Y的最大公约数是102)X和Y的最小公倍数是100[attachimg]45107[/attachimg] 107.108.[attachimg]45060[/attachimg]<FONT color=#ff.[attachimg]45061[/attachimg]<FONT color=#ff.[attachimg]45062[/attachimg]<FONT color=#ff.[attachimg]45063[/attachimg] 112. Of the 200 members of a certain association, each member who speaks German also speaks English, and 70 of the members speak only spanish. If no member speaks all three languages, how many of the members speak two of the three languages? 1) 60 of the member speak only E 2) 20 of the member do not speak any of the three languages. Answer is C.<FONT color=#ff. If y & = 0, what is the value of x? 1) lx-3l &=y; 2) lx-3l &= y. Answer is B<FONT color=#ff.A certian roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of 3 cars each time that passenger rides the roller coaster. If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars? Answer is 2/9<FONT color=#ff. If c and d are integers, is c even? 1) c(d+1) 2) (c+2) (d+4) is even. Answer is C. (Is there any shortcut to solve this sort of problem?)<FONT color=#ff. A store purchased 20 coats that each coat cost an equal amount and then sold each of the 20 coats at an equal price. What was the store's gross profit on the 20 coats?1) If the selling price per coat had been twice as much, the store's gross profit on the 20 coats would have been $2,4002) If the selling price per cat had been $2 more, the store's gross profit on the 20 coats would have been $440.Answer is B<FONT color=#ff. What is the average (arithmetic mean) height of the n people in a certain group?1) The average height of the (n/3) tallest people in the group is 6 feet (2 1/2) inches and the average height of the rest of the people in the group is 5 feet 102) The sum of the height of the n people is 178 feet 9 inches.Answer is A.
本贴41楼118.一个冷水管，单独注满池用C小时；一个热水管，单独注满池用H小时，C & H。现在两个水管一起开，注满池用了T小时。问下列哪个对：I. 0&T&H& & II. C&T&H& & III.C/2 & T & H/2答案：I + III
119.In the fraction x/y,where x and y are positive intergers, what is the value of y?1) The least common denominator of x/y and 1/3 is 62) x=1Ans is E.
120. the residents of town x participated in a survey to determine the number of hours per week each resident spent watching television. The distribution of the result of&&the survey had a mean of 21 hours and a standard deviation of 6 hours. The number of hours of that participated, a resident of town x&&telephone last week was between 1 and 2 standard deviations below the mean. Which of the following could be the number of hours the participated watched television last week?a.30& & b.20& &&&c.18& & d.12& &e.6& &answer:d
121.&&＋& &x& & y& & z4& &&&1& &-5& &me& &&&7& &n& & 10f& && &2& &-4& &5根据上面这个表格& &问 m＋n＝？答案是5 122. During an experiment, some water was removed from each of 6 water tanks. If the standard deviation of the volumes of water in the tanks at the beginning of the experiment was 10 gallons, what was the standard deviation of the volumes of water in the tanks at the end of the experiment?(1) For each tank, 30 percent of the volume of water that was in the tank at the beginning of the experiment was removed during the experiment(2) The average (arithmetic mean) volume of water in the tanks at the end of the experiment was 63 gallons.答案是A
123.&&At a certian college there are twice as many English majors as history majors and three times as many English majors as math majors. What's the ratio of the number of history majors to the number of math majors? Answer:3 to 2<FONT color=#ff. p and n are positive integers and p&n, what is the remainder when p^2 - n^2 is divided by 15?1) The remainder when p+n is divided by 5 is 1; 2) The remainder when p-n is divided by 3 is 1Answer is E
125.&&[attachimg]45146[/attachimg]126.[attachimg]45147[/attachimg]
本贴46楼127. [attachimg]45160[/attachimg]
128. n是5的倍数，且n = qp^2（q乘p的2次方）,q与p都为质数，以下哪项必须为25的倍数：1）P^2& &2）q^2&&3）pq& & 4）p^2*p^2& & 5）q *P^3答案：4）<FONT color=#ff.X为正数，以下哪项为x^2&&1/x&&2x之间的正确大小排列 1) x^2 & 2x & 1/x& &2) x^2 & 1/x & 2x& & 3) 2x & x^2 & 1/x答案为：1+2象这样的比大小一直没捉摸出做题思路，经常中圈套，有什么好方法？是不是要算出临界数？<O></O><FONT color=#ff.Of the 60 animals on a farm, 2/3 are either pigs or cows. How many of the animals are cows.1) The farm has more than twice as many cows as it has pigs.2) The farm has more than 12 pigs.答案C
131.&&for all positive integers m, "m"=3m, when m is odd and "m"=1/2m when m is even. which of the following is equivalent to "9" x "6"?81; 54; 35; 27; 18my answer is 81，the right answer is 27. why?<FONT color=#ff. at the end of the first quarter, the share price of a certain mutual fund was 20 percent higher than it was at the beginning of the year. at the end of the second quarter, the share price was 50 percent higher than it was at the beginning of the year. what was the percent increase in the share price from the end of the first quarter to the end of the second quarter?20%; 25%; 30%; 33%; 40%the right answer is 25%. why?<FONT color=#ff. if s and t are two different numbers on the number line, is s+t equal to 0?1) the distance between s and 0 is the same as the distance between t and 0.2) 0 is between s and t.the correct answer is A, my answer is C
134. [attachimg]45254[/attachimg]
135. 9.4&&9.9&&9.9&&9.9&&10.0&&10.2&&10.2&&10.5The mean and the standard deviation of the 8 numbers are 10 and 0.3. What percent of the 8 numbers are within 1 standard deviation of the mean?(75%)题目看不懂<FONT color=#ff. 分数X/Y，XY都是正整数，问Y多大？1）The least common denominator or X/Y and 1/3 is 62) X=1(E)1/3的最小分母不就是3吗？<FONT color=#ff. M是2至30的正奇数，then m is divisible by how many different positive prime number?1) m is not divisible by 3& && & 2) m is not divisible by 5(A)<FONT color=#ff. TN是两个集合，T包含5个连续整数，N包括7个连续整数，问T和N的中数是不是一样？1）T的中数为0& && &2）T所有数的和与N所有数的和相同答案C我怎么觉得条件2已经符合了<FONT color=#ff. 有个人听三个电台ABC。转到A台，如果他喜欢就听，不喜欢就转到B台，同样如果不喜欢就转到C，如果还不喜欢，就关收音机。某一刻每个台有他喜欢节目的概率都为0.3，问他将会听到他喜欢节目的概率。（0.657）
140. [attachimg]45255[/attachimg]
141.[attachimg]45256[/attachimg] 142.&&For any triangle T in the xy-coordinate plan, the center of T is defined to be the point whose x-coordinate is the average (arithmetic mean) of the x-coordinates of the vertices of T and whose y-coordinate is the average of the y=coordinates of the vertices of T.&&If a certain triangle has vertices at the points (0,0) and (6,0) and center at the point (3,2), what are the coordinates of the remaining vertex?A. (3,4)B. (3,6)C. (4,9)D. (6,4)E. (9,6)答案B, 我选A, 什么意思啊?<FONT color=#ff. If k is a positive integer, is k the square of an integer?1. k is divisible by 42. k is divisible by exactly four different prime numbers144. circle C and line k lie in the xy-plane. if circle C is centered at the origin and has radius 1, does line k intersect circle C?1) the x-intercept of line k is greater than 12) the slope of lie k is -1/10the answer is E.145. is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?1) two of the interior angles of ABCD are right angles2) the degree measure of angle ABC is twice the deree measure of angle BCD.the answer is E, why it is not C?146. set A,B,C have soem elements in common. if 16 elements are in both A and B, 17 elements are in both A and C, and 18 elements are in both B and C, how many elements do all three of the sets A, B, and C have in common?1) of the 16 elements that are in both A and B, 9 elements are also in C2) A has 25 elements, B has 30 elements, and C has 35 elements.the answer is A. why?147.at a certain store, each notepad costs x dollars and each marker costs y dollars. if $10 is engough to buy 5 notepads and 3 markers, is $10 enough to buy 4 notepads and 4 markers instead?1) each notepad costs less than $12) $10 is enough to buy 11 notepads.the answer is E. 另外还有一个问题，就是对于DATA SUFFICIENCY，如果所给的条件可以算出答案，但是是否定的答案，（如果说，问题问是否可以什么什么，但是根据所给的条件，得出来是不可以）那是应该选不SUFFICIENT 还是选可以啊？148.a manufacture produced x percent more video cameras in 1994 than in 1993 and y percent more video cameras in 1995 than in 1994. if the manufacturer produced 1,000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995?1) xy=202)x+y+ xy/100 = 9.2why the answer is B, but not C?&& 149.what fraction of this year's graduation students at a certain college are males? (1)of this year's graduation students, 33%of male and 20% of female transferred from another college (2)of this year's graduation students, 25% transferred from another college <FONT color=#ff. the rate of a certain chemical reaction is derectly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present.If the concentration of chemical B is increased by 100%, which of the follwing is closest to the percentchange in the concentration of chemical A required to keep the reaction rate unchanged.(the answer is 40%) 151. If y is greater than 110 percent of x,is y greater than 75?(1)x &75(2)y-x=10答案是A，但是我不明白为什么（2）不能推出来？<FONT color=#ff. In the rectanglar coordinate system, are the points (r,s) and (u,v) equidistant from the origin?(1)r+s=1(2)u=1-r and v=1-s答案是C，但是我不明白为什么不是E，因为从（1）和（2）可以推出它们在同一条直线上，但是在同一条直线上的点到原点的距离不一定相同啊？<FONT color=#ff. (图请看我的附件）Pat will walk from intersection X to intersection y along&&route that is confined to the square grid of four streets and three avenues shown in the map above. How many rountes from X to Y can Pat take that have the minimum possible length?6& && &&&8& && && &&&10& && & 14& && &&&16答案是10，不知道怎么算出来的……
154. When positive integer n is divided by 3, the remainder is 2; and when positive integer t is divided by 5, the remainder is 3. what is the remainder when the product nt is divided by 15?1) n-2 is divisible by 5& &2) t is divisible by 5 Answer: C<FONT color=#ff.If n denotes a number to the left of 0 on the number line such that the suqare of n is less than (1/100), then the reciprocal of n must be Answer: less than -10<FONT color=#ff. Amount charged& && && && && && && && &&&nbspercent Bonus& &$0.01 to $1,000.00& && && && && && && &&&0.5$1,000.01 to $3,000.00& && && && && && & 1.0$3,000.01 to $ 6,000.00& && && && && && &1.5$6,000.01 to $10,000.00& && && && && && &2.0At the end of each year, a certian credit card company pays a bonus to each of its credit card holders based on the amount , up to $100,000, that the card holder charged throughout the year. A 0.5 percent bonus is paid on the first $1,000 charged, a 1.0 percent bonus is paid on the next $2,000 charged and so on, as indicated in the table above. What is the maximum annual bonus, in dollars?Answer: $150
本贴56楼157.坐标平面，y=3X+2是否包含点(r,s)1，(3r+2-s)(4r+9-s)=02(4r-6-s)(3r+2-s)=0FF里面类似的题目好像说选E，可在摸考里说的C，我都觉得用不同的道理想得通，到底是什么呢？&& 本贴58楼158. & && &&&+ l&&x& &&&y& &&&z& && & 4&&l 1& & -5& & m& && & e&&l 7& &n& && &10& && &&&f&&l 2& &-4& && &5in the addition table shown above, what is the value of m+n-19; 4; 5; 6; 22the asnwer is 5p.s 因为不会上传图片，希望大家能看懂 题目本身应该有一条线从+右边一直画到f ，在4和1之间不是1 是直线，从上边一直画到下边的。希望我说明白了。<FONT color=#ff. in the rectangular coordinate system, does the line k (not shown) intersect quadrant II?1) the slope of k is - 1/62) the y-intercept of k is -6the answer is A, why?<FONT color=#ff. a circular jogging track forms the edge of a circular lake that has a diameter of 2 miles, Johanna walked once around the track at the average rate of 3 miles per hour. if t represents the number of hours it took Johanna to walk completely around the lake, which of the following is a correct statement?0.5& t& 0.75; 1.75& t& 2.0; 2.0& t& 2.5; 2.5& t& 3.0the answer is C. <FONT color=#ff. in a certain deck of cards, each card has a positive integer written on it. in a multipliaction game, a child draws a card and multiplies the integer on the card by the next larger integer. if each possible product is between 15 and 200, then the least and greatest integers on the cards could be3and 15; 3 and 20; 4 and 13; 4 and 14the answer is 4 and 13, why?<FONT color=#ff. if p is a positive integer, what is the value of p?1) p/4 is a prime number2) p is dividsible by 3the answer is Cthank you 163. in a certain conference room each row of chairs has the same numbe rof chairs, and the number of rows is 1 less than the number of chairs in a row. how many chairs are in a row?1) there is a total of 72 chirs.2) after 1 chair is removed from the last row, there is a total of 17 chirs in the last 2 rows.the answer is D each statement alone is sufficent, why? 164. a thin piece of wire 40 meters long is cut into two pieces. one piece is used to form a circle with radius r, and the other is used to form a aquare. no wire is left over. which of the following represents the total area, in saure meters, of the circular and the aquare regions in terms of r?pai r2&&;&&pai r2&&+ 10;&&pai r2 + 1/4 pai2 r2pai r2 + (40-2 pai r)2pai r2 + (10- 1/2 pai r )2答案是E，我认为是D165. a furniture dealer pruchased a desk for $150 and then set the selling price equal to the pruchase price plus a markup that was 40 percent of the selling price. if the dealer sold the desk at the selling price, what was the amount of the dealer's gross profit from the purchase and the sale of the desk?$40; $60; $80; $90; $100the answer is 100; i think is $60?166. the number 75 can be written as the sum of the squares of 3 different positive integers. what is the sum of these 3 integers?17; 16; 15; 14; 13the answer is 13想知道这个题的思路，应该如何去想？167. is x-y+1 greater than x+y-11) x&02) y&othe answer is B, my answer is C?168. an integer greater than 1 that is not prime is called compositie. if the two-digit integer n is greater than 20, is n composite?1) the tens digit of n is a factor of the units digit of n2) the tens digit of n is 2.the answer is A, why?&& 169. A boat travelede upstream a distance of 90 miles at an average spead of (V-3) miles per hour and then traveled the same distance downstream at an average of (V+3) miles per hour. If the trip upstream took half an hour longer than the trip downstream, how many hours did it take the boat to travel downstream?answer: 2.5我知道这题不难，问题是我怎么样都算不出这个答案。170. For which following function is f(a+b)=f(a)+f(b) for all positive numbers a and b?A. f(x)=X2B. f(x)=X+1C. f(x)=√XD. f(x)=2/XE. f(x)=-3XAnswer: E&& 171. if n is a multiple of 5 and n= p2q, where p and q are prim numbers, which of the following must be a multiple of 25?p2; q2 ; p2q2; p3qthe answer is p2q2,& &&&why?172. the rate of a certain chemical reaction is directly proportaional to the square of the concentration of chemical A present and inversely proportiaonl to the concentration of chemical B present. if the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the rection rate unchanged?100% 50% 40% 40% 50% increasethe answer is 40% increase, why?173. if x is an integer, is (x2+1)(x+5) an even number?1) x is an odd number.2) each prime factor of x2 is greater than 7the answer is D, 不明白第2个条件。&& 174。if n is a positive integer and r is the remainder when(n-1)(n+1) is divided by 24, what is the value of r?1) n is not divisible by 22)n is not divisible by 3the answer is C求思路，谢谢175。if there are more than two numbers in a certain list, is each of the unmbers in the list equal to 0?1)the product of any two numbers in the list is equal to 0.2) the sum of any two numbers in the list is equal to 0the answer is B, why 1) is not sufficient?176. alice's take-home pay last year was the same each month, and she saved the same fraction of her take-home pay each month. the total amunt of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take-home pay that she did not save. if all the money that she saved lat year was from her take-home pay, what fraction of her take-home pay did she save each month?1/2; 1/3; 1/4; 1/5; 1/6the answer is 1/5, why?177. if d is the standard deviation of x,y,z, what is the standard deviation of x+5,y+5, and z+5d; 3d; 15d;d+5; d+15the answer is d. why?&& 178. Accordng to the direction on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice, how many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice? Answer 25. PS: my friend, who took the GMAT on 2/6, told me he came across this problem!<FONT color=#ff.Last month 15 homes were sold in Town X. The average (arithmetic mean) sale price of the homes was $ 150,000 and the median sale price was $130,000. Which of the following statement must be true?1) at least one of the homes was sold for more than $165,0002) at least one of the homes was sold for more than $130,000 and less than $150,0003) at least one of the homes was sold for less than $130,000Answer: 1) only<FONT color=#ff.M = 4^ (1/2) + 4^ (1/3) + 4^ (1/4). The value of M is [ greater than 4] This problem may sound stupid but I wonder if there is a shortcut to do it.
本贴66楼181.Store S sold a toat of 90 copies of a certain book during the seven days of last week, and it sold different numbers of copies on any two of the days. If for the seven days Store S sold the greatest number of copies on Saturday and the second greatest number of the copies on Friady, did Store S sell more than 11 copies on Friday?1. Last week store S sold 8 copies of the book on Thursday.2. Last week store S sold 38 copies of the book on Saturday.Answer: B
182.is W greater than 1?1) W + 2 & 02) W^2 & 1Ans: E
183.Each perosn attending a fund-raising party for a certian club was charged the same admission fee, How many people attended the party?1) If the admission fee had been $0.75 less and 100 more people had attended, the club would have received the same amount in admission fees.2) If If the admission fee had been $1.50 more and 100 fewer people had attended, the club would have received the same amount in admission fees.答案: C
184. The perimeter of a certain isosceles right triangle is 16+16sqrt2, what is the length of the hypotenuse of the triangle?答案是16
185.If Bob produces 36 or fewer in a week, he is paid X dollars per item.&&If Bob produces more than 36 items, he is paid X dollars per item for the first 36 items, and 3/2 times that amout for each additional item.&&How many items did Bob produce last week?(1) Last week Bob was paid total of $480 for the items that he produced that week.(2) This week produced 2 items mor than last week and was paid a total of $510 for the item that he produced this weekkey:E<FONT color=#ff.When a certain tree was first planted, it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year, the tree was 1/5 taller than it was at the end of 4th year. By how many feet did the height of the tree increase each year?3/102/51/22/36/5第一题为什么不选C? 第二题不明白怎么算的 187. If n and m are positive integers, what is the remainder when 3^(4n+2) is devided by 10?(1)&&n=2(2)&&m=1大家帮忙看看,这道题第二个条件是不是错了?我看了题就是这样的.没抄错. 这道题答案是B. 第一个条件代入不是就可以知道余数了吗? 188.At least 10 percent of the people in Country X who are 65 year old or older employed?1) In country X, 11.3 percent of the population is 65 year old or older2) In country X, of the population 65 year old or older, 20 percent of the men and 10 percent of the women are employedAns. B=&如何判斷B充分&& 189.Each employee on a certain task force is either a manger or a director. What percent of the employees on the task force are directors?1) The average salary of the mangers on the task force is $5000 less than the average of all employees on the task force.2) The average salary of the directors on the task force is $15000 greater than the average salary of all employees on the task force.Ans. C=&請教思路為何
本贴75/76楼190.& &&&if 5^21 * 4^11=2*10^n, what is the value of n?& && &&&A,11, b, 21, c 22, d,23 e 32这种题目应该怎么去做呀。。看上去好容易，可是我忘记怎么去approach它了。。好像是有什么规则是不是呢？<FONT color=#ff.&&& &if n and m are positive integers, what is the remainder when 3^(4n+2) is divided by 10?& && & 1. n=2,& && & 2. m=1... answer is B, but why?? <FONT color=#ff.&&A certain junior class has 1000 students and a certain senior class has 800 students. Among these students, there are 60 siblings pairs each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair?& &&&A, 3/40000, B 1/3600, C. 9/2000, D, 1/60, E, 1/15<FONT color=#ff. 在问一道题目& && && && && && & r& && &&&s& && &ton the number line shown, is zero halfway between r and s?1. s is to the right of zero2. the distance between t and r is the same as the distance between t and -s. 194.IS X-Y&0?(1)X-Y&2(2)X-2Y&-6<FONT color=#ff.ANSWER IS C&&WHY?For any positive integer n, the length of n is defined as number of prime factors whose product is n, For example, the length of 75 is 3. Since 75=3*5*5. How many two-digit positive integer have length 6a.one b, one, c,two ,d.three d. fouranswer is C WHY?思路是什么?
196. The mean and the standard deviation of the 8 nnumbers shown are 10.0 and 0.3 respectively, what percent of the 8 numners are within the 1 standard deviation of the mean? 9.4&&9.9&&9.9&&9.9&&10.0&&10.2&&10.2&&10.5197. If n is a positive integer and r is the remainder when n^2 - 1 is devided by 8, what is the value of r?(1) n is odd(2)n is not devisible by 8answer A198. if m and n are integers, is m odd?(1)m+n is odd(2)m+n =n^2&&+&&5answer B199. if x and y are integers greater than 1, is x a multiple of y?(1) 3y^2&&+ 7y = x(2)x^2&&- x is a multiple of yanswer:A200. the table shows the distribution of best scores for a group of management trainees, which score internal caontains the median of the 73 scores?& && & score interval& &|& &number of scores---------------------------------------------------------------& &&&50- 59& && && && && & |& && && && & 2--------------------------------------------------------------------& & 60-69& && && && && &&&|& && && && & 10-------------------------------------------------------------------& &70- 79& && && && && & |& && && && &&&16----------------------------------------------------------------&&80-89& && && && && &&&|& && && && && &27----------------------------------------------------------&&90-99& && && && && &&&|& && && && & 18answer is 80-89. 一点sense 都没有.&&201.Five pieces of wood have an average (arithmetic mean) length of 124 centimeters and a median length of 140 centimeteres. what is the macimum possible length in centimeters of the shortest piece of wood?a. 90& &b. 100& &c.110& &d.130&&e.140answer B 202.&&A certain city with a population of 132000 is to be devided into 11 voting districts, and no district is to have a population that is more than 10 percent greater than the population of any other district. What is the minimum possible population that the least populated district could have?107001080010900110001100<FONT color=#ff. The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A resent and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?100% decrease50% decrease40% decrease40% increase50% increase
204.IS X-Y&0?(1)X-Y&-2(2)X-2Y&-6ANSWER IS C&&WHY? 205. if n is a multiple of 5 and n= p2q, where p and q are prim numbers, which of the following must be a multiple of 25? <O></O>p2; q2 ; p2q2; p3q<O></O>the answer is p2q2,& &&&<O></O>why?<FONT color=#ff. When a certain tree was first planted, it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year, the tree was 1/5 taller than it was at the end of 4th year. By how many feet did the height of the tree increase each year?3/102/51/22/36/5
207.If $1,000 is deposited in a certain bank account and remains in the account along with any accumulated interest, the dollar amount of interest, I, earned by the deposit in the first n years is given by the formula I=1,000((1+r/100)n-1), where r percent is the annual interest rate paid by the bank. Is the annual interest rate paid by the bank greater than 8 percent?(1) The deposit earns a total of $210 in the interest in the first two years(2) (1+r/100)2&1.15答案是A 208.&&A certain meter records voltage between 0 volts and 10 volts, inclusive. If the average (arithmatic) value of 3 recording on the meter was 8 volts, what was the smallest possible recording, in volts?A.2B.3C.4D.5E.6209.In a certain conference room each row of chairs has the same number of chairs, and the number of row is 1 less than the number of chairs in a row. How many chairs are in a row? (1)there is a total of 72 chairs.(2)after 1 chair is removeal from the last row, there is a total of 17 chairs in the last 2 rows.Answer&&D 210.Is the hundredths digit of the decimal d greater that 5?(1) the tenth digit of 10d is 7;(2) the thousandths digit of d/10 is 7.answer<FONT color=#ff.If C and D are integers, is C even?(1)c(d+1)even(2)(c+2)(d+4)evenanswer: C<FONT color=#ff.If -2x&3y, is X negative?(1)y&0(2)2x+5y-20=0answer<FONT color=#ff.If a coin has an equal probability of landing heds up or tails up each time it is flipped, what is the probability that coin will land heads up exactly twice in 3 consecutive flips?answer:0.375<FONT color=#ff.the interger m and p are such that 2&m&p, and m is not a factor of p. if r is the remainder when p is divided by m. is r&1?(1) the greatest common factor of m and p is 2;(2) the least common factor of m and p is 30anwer:A 215.&&The residents of Town X participated in asurvey to determine the number of hours per week each resident spent watchingTV. The distribution of the results of the survey had a mean of 21 hours and astandard deviation of 6 hours. The number of hours that Pat, a resident of TownX, watched TV last week was between 1 and 2 standard deviations below the mean.Which of the following could be the number of hours that Pat watched TV lastweek?&&30; 20; 18; 16; 6. The answer is D, but I choose C.....Thank you. 216.[attachimg]45987[/attachimg]&& 217. [attachimg]45988[/attachimg]
218.2+2+22+23+24+25+26+27+28=?&& 219. [attachimg]46018[/attachimg]<FONT color=#ff. [attachimg]46019[/attachimg] 221. 1. set A,B,C have soem elements in common. if 16 elements are in both A and B, 17 elements are in both A and C, and 18 elements are in both B and C, how many elements do all three of the sets A, B, and C have in common1) of the 16 elements that are in both A and B, 9 elements are also in C2) A has 25 elements, B has 30 elements, and C has 35 elements.<O></O>the answer is A这题前面链接里有，但只说了（1）是成立的，A、B、C共9个元素，我还想问一下，为什么（2）算不出来？ 集合问题超差的说~~~<FONT color=#ff. 223.<FONT color=#ff.<FONT color=#ff.226.&&If ab&&0 and points (-a,b) and (-b,a) are in the same quadrant of the xy-plane, is point (-x,y) in this same quadrant?(1) xy&0(2) ax&0 227. The figure shown the measure of angle PRS is how many degree greater than that of angle PQR.(1)& & the measure of angle QPR is 30.(2)& & The sum of the measures of angle PQR and PRS is 150Answer: each state alone is sufficient. 228. when positive integer n is devided by 3, the remainder is 2, when positive interger t is divided by 5, the remainder is 3, what is the remainder of nt when devided by 15?(1) n-2 is divided by 5(2) t is&&divided by 3 229. In the x-y plane, what is the y=intercept of the line l?1) The slope of the line l is 3 times its y intercept.2) The x-intercept os line l is -1/3我觉得答案应该是C, 可是标准答案是E. 230.Is the hundredths digit of the decimal&&D is greater than 5 ?1) the tenth digit of 10D is 7.2)the thousandths digit of D/10 is 7.&& 231. 232. 233.
234.&&235.& &&&<FONT color=#.4&&9.9&&9.9&&9.9&&10.0&&10.2&&10.2&&10.5The mean and the standard deviation of the 8 numbers shown are 10.0 and 0.3,respectively, what percent of the 8 numbers are within 1 standard deviation of the mean?Ans:75%236. If n and p are integers, is p&0?<FONT color=#,n+1&0& && &&&2,np&0Ans:C237. The number x and y are not integers, the value of x is closest to which integer?<FONT color=#, 4 is the integer that is closest to x+y<FONT color=#, 1 is the integer that is closest to x-yAns:E238. Five pieces of wood have an average(arithmetic mean) length of 124 cm and a median length of 140 cm, what's the max possible length, in cm, of the shortest piece of wood?Ans: 100239.关于the least common denominator of x/y and 1/3 is 6怎么理解啊？x/y和1/3的最小公约数是6，什么意思？没概念么&& 240.A certain jar contains only"b" black marbles, 'W" white marbles, and "r" red marbles. If one marble is to be chosen at random from the jar, is the porobability that the marble chosen will be red greater than the probability that the marble chosen will be white?(1) r/(b+w) & w/(b+r)(2) b-w&r答案為A 241.<FONT color=#.51 8.22 7.86 8.368.09 7.83 8.30 8.017.73 8.25 7.96 8.53A vending machine is designed to despense 8 ounces of coffee into a cup.After a test that recorded the number of ounces of coffee in each of 1,000 cups dispensed by the vending machine, the 12 listed amounts, in ounces, were selected from the data. If the 1,000 recorded amounts have a mean of 8.1 ounces and a standard standard deviation of 0.3 ounce, how many of the 12 listed amounts are within 1.5 standard deviations of the mean?答案是11&& 242. Which of the following inequlities has a solusion set that when graphed on the number line, is a single segment of finite length?a. x^4&=1b. x^3&=27c. x^2&=16d. 2&=I1I&=5e. 2&=3x+4&=6ANS: E我觉得BCDE都可以呀, 都是有限的.<FONT color=#ff. .IF r and s are intergers and rs+s is odd, which of the following must be even?a.rb.sc, r+sd. rs-re. r^2+sANA: CRS+S 是偶数, 则RS和S必须都是偶数=& S是偶数或R是偶数或都是ODD. =& R+S不一定是偶数呀?<FONT color=#ff. IF the operation is defined for all integers a and b by a@b=a+b-ab, which of the following statement must be true for all a, b,c,ANS: (A@B)@C=A@(B@C)不明白这是如何得来的?<FONT color=#ff. a certain library accesses fines for overdue books as follows. on the first day that book is overdued, the total fine is $0.1, for each additional day that the book is overdue, the total fine is either increased by $0.30 or doubled,whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue?ANS: $0.7
246.偶正整数N,有h(n)=2*4*6*....*n,若p是h(100)+1的最小质因子,求P2~10& && & 10~20& & 20~30& && &30~40& &&&40以上<FONT color=#ff.观光客,women/children=5/2,求men's number?(1)children/men=5/11(2)women's number was less than 30答案为c&&我选的e&&算得men's number&26(2/5) 具体是多少又得不到,为什么是c呢?还有一题刚开始头都看晕了:<FONT color=#ff.在食堂就餐的学生,要么喜欢要么不喜欢LB这种食物,要么喜欢或不喜欢BS这种食物,有2/3不喜欢LB,2/3中又有3/5不喜欢BS,问有多少学生喜欢BS,但不喜欢LB?(1)120人在食堂就餐(2)有40个学生喜欢LB选D 249. What is the greatest possible area of a triangular region with one vertex at the center of a circle of radius land the other two vertices on the circle?(不懂如何時是最大)& && && && && && && && && && && && && && && && && && && && && && && && && && && && && && &Ans. 1/2<FONT color=#ff. In May Mr. Lee's earings were 60 percent of the Lee family's total income. In June Mrs. Lee earned 20 percent more than in May. If the rest of the family's income was the same both months, then, in June, Mrs.Lee's earnings were approximately what percent of the Lee Family's total income?(黃色那句話實在看不懂)& && && && && && && && && && && && && && && && && && && && && && && && && && && && && &&&Ans. 64%<FONT color=#ff. If m and r are two numbers on a number line, what is the value of r?(1) The distance between r and 0 is 3 times the distance between m and 0.(2)12 is halfway between m and r& && && && && && && && && && && && && && && && && && && && && && && && && && && && && && &Ans. E& & (我選C)
252.If n is a positive integer and r is the remainder when 4+7n is divided by 3, what is the value of r?<FONT color=#) n+1 is divisible by 3<FONT color=#) n&20选A&&253.&&X^4+y^4=100 ，then the greatest possible value of x is betweenA 0 and 3B 3 and 6C 6 and 9D 9 and 12E 12 and 15我选的A& &,& & 答案是B 254.255. Amy's grade was the 90th percentile of the 80 grades for her class. Of the 100 grades from another class, 19 was higher than Army's and the rest was lower. If no other grade is the same as Amy' grade, then Army's grade was what percentile of grades of two class combined.A 72thB 80th C 81thD 85thE 92 ndthe answer is D 256。if d is a positive integer and f is the product of the first 30 positive integers, what is the value of d?& && &a, 20^d is a factor of f& && & b, d & 6& & anw: C& && &我认为，这个题目无解，无解选C? 理由：条件1&&d 小于等于6，条件2要大于6。请指点&& 257。if n is a positive integer less than 200 and 14n/60 is an integer, then n has how many different positive prime factors?<FONT color=#. two<FONT color=#.three 正确<FONT color=#.five<FONT color=#.six<FONT color=#eight.&&258。.XY+Z为奇数，说明XY，Z一奇数一偶数。即可能X，Y为奇数，Z为偶数；X，Y其一或二为偶数，Z为奇数。问X是否偶数？（1）XY+XZ为偶数，（2）Y+XZ为奇数， 259。 && && 最新更新于200 6.5.10[glow=200,red,2]谨以此篇献给所有06年的G友,祝大家顺利杀G![/glow]
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&一、二楼为GMATPrep（新ＰＰ）的讨论汇总收录．遗漏在所难免，为使题库汇总更加完善，恳请大家积极跟帖补充，我将会尽快在楼上更新！谢谢！BTW:有些题有重复，但因链接不同，解释程度不同，所以并未去掉，一并供大家参考TIPS：快速查找问题的方法用IE里的查找功能（在“编辑”菜单下面）就好了，以关键词搜索一下，就可以找到相关的题。当然图片类的，大概浏览一下就可以了。不要一道一道题的看过去。续：[原创]GMATPrep 数学讨论题库汇总(II)
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Good job!非常感谢！不过此讨论贴最麻烦的地方在于GMATPREP没有固定题号。因此可能会导致再发贴的人不会有耐心翻完所有的贴来看他的问题是否问过。一点建议：1。是否可参照MATH JJ的作法，做个原始贴，贴出原题，然后后面跟讨论。就是工作量太大了。2。或者可以让大家一旦有GMATPREP的疑问都在此贴跟贴，不再另外发贴，然后将所发问题COPY至顶楼，就会尽量避免题目重复发问。仅供参考。[此贴子已经被作者于 17:18:11编辑过]
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替斑斑转一个，方便时加到上面吧On Jane's credit card account, the average daily balance for a 30-day billing cylce is average(arithmetic mean) of the daily balances at the end of the 30 days. At the begining of a certain 30-day billing cycle, Jane's credit card account had a balance of $600. Jane made a payment of $300 on the account during the billing cycle. If no other amounts were added to or substracted from the account during the billing cycle, what was average daily balance on Jane's account for the billing cycle?1) Jane's payment was credited on the 21st day of the billing cyle.2) The average daily balance through the 25th day of the billing cycle was $540.答案是D, each statement ALONE is sufficient.
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以下是引用hitlzc在 22:00:00的发言：替斑斑转一个，方便时加到上面吧On Jane's credit card account, the average daily balance for a 30-day billing cylce is average(arithmetic mean) of the daily balances at the end of the 30 days. At the begining of a certain 30-day billing cycle, Jane's credit card account had a balance of $600. Jane made a payment of $300 on the account during the billing cycle. If no other amounts were added to or substracted from the account during the billing cycle, what was average daily balance on Jane's account for the billing cycle?1) Jane's payment was credited on the 21st day of the billing cyle.2) The average daily balance through the 25th day of the billing cycle was $540.答案是D, each statement ALONE is sufficient.谢谢,已加入!
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我们总是已忙为理由很少奉献 但是真的非常感谢楼主的辛勤劳动我们愿 愿把题库做干 谢谢楼主 和所有CD的斑竹了
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以下是引用jfw1115在 23:34:00的发言：我们总是已忙为理由很少奉献 但是真的非常感谢楼主的辛勤劳动我们愿 愿把题库做干 谢谢楼主 和所有CD的斑竹了等着你做干了好汇总哦!加油!
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太棒了！另外37题=46题
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