请教TTmath5中的两道题

GSQQ · 发表于 2010-4-17 11:11:41

Q25:
If the number 52,1n9, where n represents the tens digit, is a multiple of 3, then the value of n could be which of the following?

A.   6
B.   5
C.   3
D.   1
E.   0
Answer: D

我感觉应该选B, 1n9是3的倍数的话，那么1+n+9应该是3的倍数才对,所以我选了B。不知道是答案有问题还是我理解错了。

Q30:
Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy?
(1)    She bought $4.40 worth of stamps.
(2)    She bought an equal number of $0.15 stamps and $0.29 stamps.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: A

使用第一个条件的话，是不是一个个组合的凑，我凑了好久很费时，想请教大家的思路~

cynthia604121 · 发表于 2011-2-18 15:34:07

第一题楼主看错了= = 是52,1n9 5+2+1+n+9是3的倍数所以选1

第二题全部4.40买1。5的不现实不能整除
如果要买0.29的只有买10张才能使得tenth digit of decimal变成0
所以是各买了10张···

请教TTmath5中的两道题

所属分类: GMAT考试

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