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My grandmother is very old.She is 84.She is four time as old

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