求解PREP题~

nikkoyu · 发表于 2010-9-15 13:00:49

1)If n is a multiple of 5 and n=p^2q,where p and q are prime numbers, which of the following must be a multiple of 25?
A. p^2 B. q^2 C. pq D.p^2q^2 E. P^3q

2) For each of her sales, a saleswoman receives a commission equal to 20% of the first $500 of the total amount of the sales, puls 30% of the total amount of the sale in excess of $500. If the total amount of one of her sales was $800, the saleswomna's commission was approximately what percent of the total amount of the sale?
A.22% B. 24% C.25% D.27% E.28%

3) Is m+z>0?
1. m-3z>0 2. 4z-m>0 选C？

4) What is the greatest common divisor of positive integers m and n?
1. m is a prime number.
2. 2n=7m C？

麻烦各位NN帮忙解释一下~

seyouji · 发表于 2010-9-15 13:27:11

1、D
5x=p^2q
25x=？（1）p=5，p^2q(2)p!=5,q=5,p^2q^2
must be p^2q^2
2、B
500×20%+300*30%=190
190/800=24%
3、C
（1）（2）=>Z>0 AND 3Z<M<4Z
4.C
2n/7 is prime=>n=7,m=2

cynthia604121 · 发表于 2011-2-18 15:34:35

同求第一题我怎么没看懂···

lindsay12 · 发表于 2011-2-18 15:48:41

举几个例子就可以了。

求解PREP题~

所属分类: GMAT考试

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