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Robert’s father is 4 times as old as Robert. After 5 years, father will be three times as old as Robert. Find their present ages.

Solution

Robert’s father is 4 times as old as Robert. After 5 years, father will be three times as old as Robert. Find their present ages.

Solution

Robert^{'} s age is : 10

Father^{'} s age is : 40

Solution steps

Translate the problem into an equation:

4 x + 5 = 3 (x + 5)

Solve for

x, 4 x + 5 = 3 (x + 5) : x = 10

Find age

Robert^{'} s age is : 10

Father^{'} s age is : 40

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