Question

Roberts father is 4 times as old as Robert. After five years father will be three times as old as Robert . Find their present ages

Answer 1

Let Robert’s age be x years. 

Then Robert’s father’s age = 4x

After 5 years, Robert’s age = x + 5

Father’s age = 4x + 5


According to the question, 

4x + 5 = 3(x + 5) 

4x + 5 = 3x + 15

4x - 3x = 15 - 5

x = 10


$\therefore{}$ Age of Robert => x => 10 years


$\therefore{}$ Age of Robert's father => 4x => 4 × 10 => 40 years

Answer 2

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