大家再帮我看看这道数学题吧 也是PREP1上的~

totalgloria

题目是这样的

Alice’s take-home pay last year was the same each month, and she savedthe 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 moneythat she saved last year was from her take-home pay, what fraction of hertake-home pay did she save each month?
A.1/2   B. 1/3   C.4/1    D.5/1     E.6/1


答案是D


题目我读了好多遍，尤其是不理解红色的that portion是指什么？第二句的意思难道不是说Alice在一年存下来的钱的总数是她没存下来的钱数的3倍吗？ 如果是这个意思的话，那就没有答案啦~
实在是想不明白呀

大家帮我看看呗，先谢谢啦 哈哈

eeyore0827

alice's annual saving = 3* what she did not save per month

pandaforever

Alice’s take-home pay last year was the same each month, and she savedthe 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 moneythat she saved last year was from her take-home pay, what fraction of hertake-home pay did she save each month?
A.1/2   B. 1/3   C.4/1    D.5/1     E.6/1

Alice每个月拿回家的工资数目都一样(比如x），而且她每个月存下的钱占总工资的比例都不变（比如y%)。一年下来，她存钱的总数（12*y%
*x)是单独一个月没有存下的那部分钱{（100%-y%）*x}的三倍。  问，如果她的钱都是从工资里存下的，那么y%是多少

that portion 就是没被存下的钱的比例

totalgloria

恩恩 明白啦
原来是拿一年存的钱和一个月没存的钱做比较的
谢谢楼上两位好心人 解释得好清楚 嘻嘻~~
不过估计考试时候再出现我可能还是看不到这么细致 哎