prep07数学62题

sharonyyyy · 发表于 2011-8-8 21:41:32

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

请问这道题答案是什么?

dadadaxia · 发表于 2011-8-9 02:27:38

记 monthly take-home pay 为P，记money monthly saved为S
则，12S=3（P-S），化简一下，P=5S

sharonyyyy · 发表于 2011-8-10 12:25:42

哦哦明白了..谢谢!!

prep07数学62题

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