一道prep数学题怎么算都算不出来，谢谢啦。

nedvedxmu · 发表于 2011-7-5 17:57:55

62.7564-!-item-!-187;#058&005577

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 amount 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 last year was from her take-home pay, what fraction of her take-home pay did she save each month?

(A) 1/2

(B) 1/3

(C) 1/4

(D) 1/5

(E) 1/6

怎么算都算不出来。假设每月存的比例为x，没存的为1-x
x=3*（1-x）

x=3/4
谢谢。

yehimesama · 发表于 2011-7-5 18:18:48

3 times the amount of that portion of her monthly take-home pay that she did not save
注意一年所有存的钱是比每月没存的多3倍啊~

yehimesama · 发表于 2011-7-5 18:20:00

12x=3(1-x)

shevit · 发表于 2011-7-5 18:22:36

设存的比例是x%，每月钱P。则有P*x%*12=3(1-x%)然后可以算出x%=1/5

nedvedxmu · 发表于 2011-7-5 19:13:07

谢谢，真是太粗心了。

Heather_Lau · 发表于 2011-7-5 19:37:06

昨天才有人求教这个问题.
注意年存款额是"每月"花掉钱的2倍,找到这个equation就能做出来了.

王凯丽 · 发表于 2011-7-5 19:46:05

要看清题目噢

一道prep数学题怎么算都算不出来，谢谢啦。

所属分类: GMAT考试

正在浏览此版块的会员 ()