My grandmother is very old.She is 84.She is four time as old as I am.How old am

题目

My grandmother is very old.She is 84.She is four time as old as I am.How old am

答案

I am 21 years old.
我外婆年纪非常大,她今年84岁,是我年纪的4倍,我几岁?84/4=21岁啊
4 times as old as 是4倍于后面比较的对象,即大（4-1）=3倍