The age of a father is thrice the age of his daughter. Ten years ago, his age was five times his daughter's age. Find the present age of the father.

50 years 60 years 45 years 40 years

60 years

The ratio of father and son = 1 : 3 Ten years ago the age = x - 10 : 3x - 10 Actual ratio ten years ago = \(\frac{x - 10}{3x - 10}\) = \(\frac{1}{5}\) = 5x - 50 = 3x - 10 2x = 40 x = 20 The present age of father = 3x = 3 × 20 = 60