GMAT数学题典型做法解析

　　在做GMAT数学题的时候，会用到很多不同知识点，而这些知识点又是零散的，所以需要人工总结起来，以便于我们更快捷地进行GMAT复习，留学360为大家总结了GMAT数学题的一些典型做法，希望对大家有所帮助。

　　PREP

　　7. 905-!-item-!-187;#058&000575

　　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 is 用余数来解决

　　(A) between 2 and 10

　　(B) between 10 and 20

　　(C) between 20 and 30

　　(D) between 30 and 40

　　(E) greater than 40

　　选E

　　34. 2927-!-item-!-187;#058&003024

　　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.

　　36. 4841-!-item-!-187;#058&004235

　　In a certain deck of cards, each card has a positive integer written on it. In a multiplication game, a child draws(抽) a card and multiplies the integer on the card by the next larger integer(下一个数). If each possible product is between 15 and 200, then the least and greatest integers on the cards could be

　　(A) 3 and 15

　　(B) 3 and 20

　　(C) 4 and 13

　　(D) 4 and 14

　　(E) 5 and 14

　　【答案】C

　　48. 6225-!-item-!-187;#058&004914

　　A certain city with a population of 132,000 is to be divided 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?

　　最大比其他城市大不超过10%，那就设除了最小的以外都比它大10%

　　(A) 10,700

　　(B) 10,800

　　(C) 10,900

　　(D) 11,000

　　(E) 11,100

　　【答案】D

　　55. 6892-!-item-!-187;#058&005291

　　Which of the following inequalities has a solution set that, when graphed on the number line, is a single line segment of finite(有限的) length?

　　(A) X4 ≧ 1

　　(B) X3 ≦ 27

　　(C) X2 ≧ 16

　　(D) 2 ≦ |X| ≦ 5

　　(E) 2 ≦ 3X + 4 ≦ 6

　　57. 7044-!-item-!-187;#058&005427

　　If n is a multiple of 5 and , where p and q are prime numbers, which of the following must rt be a multiple of 25 ?

　　(A) (B) (C) (D) (E)

　　【答案】D

　　60. 7189-!-item-!-187;#058&005472

　　Rates for having a manuscript typed at a certain typing service are $5 per page for the first time a page is typed and $3 per page each time a page is revised. If a certain manuscript has 100 pages, of which 40 were revised only once, 10 were revised twice, and the rest required no revisions, what was the total cost of having the manuscript typed? 这题注意：要revised在revise之前也要第一次type一下!

　　(A) $430

　　(B) $620

　　(C) $650

　　(D) $680

　　(E) $770

　　【答案】D

　　42. 3744-!-item-!-187;#058&003565

　　John and Mary own shares of stock in a certain company. Does John own more shares of the company‘s stock than Mary?

　　(1) Mary owns more than 500 shares of the company’s stock.

　　(2) The number of shares of the company‘s stock that John owns is 400 less than twice the number of shares of the company’s stock that Mary owns.

　　选C

　　(1)M>500

　　(2) J=2M-400 =M+(M-400)>M

　　通过上文相信不少同学对GMAT数学题中的一些概念有了一定的了解，掌握这些概念，并把这些概念运用到实际解题当中，融会贯通，才能在GMAT考试中取得优异的成绩。