RRB Group-D Model Paper 12 with answers for online practice

Let the son’s ages be ‘x’ years and ‘y’ years
Given, x - y = 5
⇒ x = y + 5
Now,
Ratio of their shares = ratio of their ages
⇒ 54000 ∶ 48000 = x ∶ y
⇒ 9 ∶ 8 = (y + 5) ∶ y
⇒ 9y = 8y + 40
⇒ y = 40
∴ The younger son’s age is 40 years