Mnm is five times as old as my sister.How old is mum now?Mum is five times as old as my sister.In 15 years mun will be twice as old as my sister How old is mum now?

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Mnm is five times as old as my sister.How old is mum now?Mum is five times as old as my sister.In 15 years mun will be twice as old as my sister How old is mum now?

Mnm is five times as old as my sister.How old is mum now?Mum is five times as old as my sister.In 15 years mun will be twice as old as my sister How old is mum now?
Mnm is five times as old as my sister.How old is mum now?
Mum is five times as old as my sister.In 15 years mun will be twice as old as my sister How old is mum now?

Mnm is five times as old as my sister.How old is mum now?Mum is five times as old as my sister.In 15 years mun will be twice as old as my sister How old is mum now?
Mum is five times as old as my sister.In 15 years mun will be twice as old as my sister How old is mum now?
中文即妈妈是姐姐年龄的5倍,15年后妈妈是姐姐年龄的2倍,求妈妈现在的年龄.
设妈妈现在年龄=A,姐姐现在年龄A/5,
A+15=2*(A/5+15)
得A=25
即Mum is 25 years old now.

题中的SISTER有多大?
我只知道妈妈的年龄是姐姐(妹妹)的5倍

you must miss some detail.

这道题应该是:妈妈今年的年纪是妹妹的五倍,**年以后是妹妹年纪的**吧。
后面一句呢?漏掉了吧,肯定有后面一句的,以前我做过这种题。
妈妈现在25岁,妹妹现在5岁;
15年后妈妈40岁,妹妹20岁。

妈妈的岁数是姐姐(妹妹)的五倍,那妈妈多少岁了?
------脑筋急转弯???

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