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

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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?

选项 A、32
B、48
C、64
D、80

答案 C

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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