丁丁今年9岁，他奶奶57岁。再过几年，奶奶的年龄正好是丁丁的5倍呢？用小学方法解！！！！！！

3年。三年后丁丁12岁，奶奶60岁，60/12=5.

5(9+X)=57+X
45+5X=57+X
4X=12
X=3

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3年