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a father is 4 times as old as his son. in 20 years the father will be twice as old as his son

解答

a father is 4 times as old as his son. in 20 years the father will be twice as old as his son

解答

Boy^{'} s age is : 10

Father^{'} s age is : 40

求解步骤

Translate the problem into an equation:

4 x + 20 = 2 (x + 20)

求解

x, 4 x + 20 = 2 (x + 20) : x = 10

找到 age

Boy^{'} s age is : 10

Father^{'} s age is : 40

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