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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
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2024-08-13
42
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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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