小學生解法

來源: 15少 於 2010-02-24 14:03:44 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (302 bytes)

so tom's age = 2 x(jerry's age in the past) = 2 x (the difference between tom's actual age and jerry's age in the past, which is twice the difference between their age).

so tom's age = 4 times the difference between their age.

jerry's age = 3 times the difference between their age.

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