求助，Prep 数学题

duduer

1、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

Louis0393

答案是D么？
我数学不太好 不知道对不对？
设SAVE的分数为X
得到3（1-x）=12x
   x=1/5

用头走路

D，害的我算了半天，楼主注意这句话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.说他存了一年的钱是他一个月没存的钱的3倍，理解了吧？能理解了就应该没问题了

duduer

是的，谢谢哈

duduer

D，害的我算了半天，楼主注意这句话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.说他存了一年的钱是他一个月没存的钱的3倍，理解了吧？能理解了就应该没问题了

-- by 会员 用头走路 (2011/8/29 10:58:46)

果然没有理解这句话啊，谢谢哈