Question

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 age.

Answer 1

Let,
Robert's age = x
Robert's father age = 4x

A/Q,
4x + 5 = 3(x+5)
3x + 5 = 15
x = 10

Therfore,
Robert's age = x = 10 yrs
Robert's father age = 4x = 40 yrs

Answer 2

let the Robert be =x
father be=4x
4x+5=3(x+5)
x=10
father be=4x , so 4(10) = 40 hence , the age of father be 40 and age of Robert be 10