大意为：一个人和他儿子总共51岁 3年前是这个人年龄是他儿子的8倍
知道意思应该非常简单了
设这个人儿子3年前的年龄为X岁 根据题意得
x+3+8x+3=51
解之得
x=5
题目中要求现在儿子的年龄 所以为5+3=8（岁）
the total age of hebrew and his son is 51.3 years ago,hebrew
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