Average age of P and Q is 24 years. Average age of P, Q and R is 22 years. Find the sum of their ages in last year.

Correct option is B

The average of ages of P and Q is 24 years.
Average age of P, Q and R is 22 years.
Formula:
If average age of A and B after x years is y, present average age = y - x
Calculation:
Let the present ages be P, Q and R respectively.
(P+Q)/2 = 24
=> (P+Q) = 48---(i)
(P+Q+R)/3 = 22
=>(P+Q+R) = 66----(ii)
From above equation we only get the sum of ages but information is not available about time, like present age, after some years and before some years.