Explanation:

Correct option:4

Given that the ratio between the P and Q age is 7: 9.

The difference between the present ages of Q and P’s age after 4 years is 2 

Let age of P is 9x and that of Q is 7x.

So
9x – (7x +4) = 2
x = 3

Age of P is 9x=9 x 3=27
Age  of Q is 7x= 7 x 3=21
The total of the present ages of P and Q= 27 + 21 = 48