5 years ago a man was 7 times as old as his son. After 5 years he will be thrice as old as his son. Find their present ages.
Let the age of son be x years, 5 years ago and that of father be x years
According to the question
⇒ 4x = 140
⇒ x = 35
So the present age of father = 35 + 5 = 40 years and that of son is x + 5 = 5 + 5 = 10 years