Let the present age of the man be x The present age of son = y One year ago, his age = x – 1 One year ago, age of son = y – 1 According to the question: (x−1)=7(y−1) ⇒x−1=7y−7 ⇒x−7y=−6(1) Also, x=y2(2) By (1) and (2) y2−7y=−6 ⇒y2−7y+6=0 ⇒y2−6y−y+6=0 ⇒(y−6)(y−1)=0 ∴y=6 Son's present age =6 years. Father's present age =36 years