A girl asks her mother how old she is.Mum:When i was your pr

问题描述:

A girl asks her mother how old she is.Mum:When i was your present age,you were2.
when you are at my present age,i will be 38.
Can you find how old the mum is?
1个回答 分类:英语 2014-11-29

问题解答:

我来补答
孩子他妈26,孩子14.
假设孩现在他妈年龄X,孩子年龄Y.孩他妈比孩子大(X-Y)岁.则孩子在(X-Y)年前为2岁,孩他妈在(X-Y)年后为38,得出以下方程组:
Y-(X-Y)=2
X+(X-Y)=38
可以解得X=26,Y=14.
we assumption that the age of the mum is X and the girl's age is Y now.so the mum is (X-Y) years elder than the girl.we can knwo that the girl was 2 (X-Y)years befor and the mum will be 38 (X-Y)years later,so we can get following functions:
Y-(X-Y)=2
X+(X-Y)=38
the solution is:X=26,Y=14.
 
 
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