IBPS Clerk Prelims Model Paper 6

Let the present ages of A & B be x years and y years respectively.
x+y=66 ...(i)
(x + 4)/(y- 6) = 5/3 ...(ii)
Solving equations (i) and (ii), we get x = 36, y = 30
So, the present age of B is 30 years.