Tips & Tricks Let ‘a’ be Rohit’s son’s present age. Rohit was 4 times as old as his son 8 years ago. Rohit’s age = 4(a – 8)After 8 years, Rohit will be twice as old as his son. Rohit’s age = 2(a + 8) According to question: 2(a+8)−4(a−8)=16 ∴ 2a+16−4a+32=16 ∴ −2a+48=16 ∴ −2a=16−48 ∴ −2a=−32 ∴ a=16 After 8 years, Rohit’s age = 2(a + 8) So, present age of Rohit = 2(a + 8) - 8 = 2(16 + 8) - 8 = 2(24) - 8 = 48 - 8 = 40 Hence, Rohit’s present age is 40 years