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  3. A man is 48 years old. He asks the other man how old he is. The other man answer

A man is 48 years old. He asks the other man how old he is. The other man answer

游客2024-08-13  61
问题 A man is 48 years old. He asks the other man how old he is. The other man answers: "I am twice as old as you were when I was as old as you are today. " How old is the other man?
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答案 64
解析 假定我现在X岁，当我48岁时，你的年龄是Y岁。因而，X=2Y，X-48=48-Y，用这两个等式，得出X=64.  
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