In five years time a father will be three times as old as his son. Four years ago, the father was six times as old as his son. Find their present ages.

解答

解答

Father^{'} s age is : 40

Boy^{'} s age is : 10

求解步骤

Translate the problem into an equation:

x + 5 = 3 (y + 5), x - 4 = 6 (y - 4)

x + 5 = 3 (y + 5), x - 4 = 6 (y - 4) : x = 40, y = 10

Father^{'} s age is : 40

Boy^{'} s age is : 10

流行的例子

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