Let Mr Manu be x years old and Adu be y years old. But Mr Manu is four times as old as Adu then, x = 4y. 7 years ago, the sum of their ages was 76. ( x - 7) + ( y - 7) = 76 x + y - 14 = 76 x + y = 76 + 14 = 90 But x = 4y Therefore, 4y + y = 90 5y = 90 y = \(\frac{90}{5}\) y = 18 Therefore Adu is 18 years old.