Let Aman’s son’s age be x years. Therefore, Aman’s age will be 3x years. Ten years ago, their age was (x − 10) years and (3x − 10) years respectively. According to the question,
10 years ago, Aman’s age = 5 × Aman’s son’s age 10 years ago
3x - 10 = 5(x - 10)
3x - 10 = 5x - 50
Transposing 3x to R.H.S and 50 to L.H.S, we obtain
50 - 10 = 5x - 3x
40 = 2x
Dividing both sides by 2, we obtain
20 = x
Aman’s son’s age = x years = 20 years
Aman’s age = 3x years = (3 × 20) years = 60 years
