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人気のある >

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

解

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

解

Boy^{'} s age is : 10

Father^{'} s age is : 40

解答ステップ

Translate the problem into an equation:

4 x + 20 = 2 (x + 20)

x

を解く

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

発見する age

Boy^{'} s age is : 10

Father^{'} s age is : 40

人気の例

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