Alice's take-home pay last year was the same each month, and sha saved the same fraction of her take-home pay each month.The total amount of monet 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 sace each month?

这个题目都没太绕清楚，请求高手指点！不胜感激额！

题干翻译：去年Alice的实际工资每个月都是一样的，她每个月都回将实际工资中的相同比例的部分存起来。到了年底，alice存钱的总数是她每个月实际工资中没有被存起来那部分的3倍。如果去年alice的存款都来自她的实际工资，那么她每个月存了她实际工资的几分之几？

设每个月Alice的存款部分是为她实际工资的x，实际工资为A，则根据题意得：

3*A（1-x）=12Ax；

5x=1

x=1/5

看明白了么？