Question

The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is:
1) 3500
2) 4050
3) 5000
4) 4000

Answer 1

we have 

P + Q = (5050 x 2) = 10100 .... (i)

Q + R = (6250 x 2) = 12500 .... (ii)

P + R = (5200 x 2) = 10400 .... (iii)

Adding (i), (ii) and (iii)

we get  P + Q + R = 16500 .... (iv)

now (ii)-(iv) so we get

P = 4000.

i.e option 4) 4000