my grandma is 84.she is four times as old as am .how old am

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my grandma is 84.she is four times as old as am .how old am

这句话的意思是:我的奶奶84岁,是我的年龄的四倍,那我几岁呢?你可以回答:I am 21 .

I'm 21.

you are 21 years old

21