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

【参考答案】

64 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。