The average monthly income of P and Q is Rs. 6050. The average monthly income of Q and R is Rs. 7050 and the average monthly income of P and R is Rs. 8000. The monthly income of P+Q+R is:  Choose the correct choice
A) 41100
B) 42000
C) 21100
D) 42200
E) 21000
Explanation:   Let P, Q and R represent their respective monthly incomes. Then, we have:   P + Q = (6050 x 2) = 12100 .... (i)   Q + R = (7050 x 2) = 14100 .... (ii)   P + R = (8000 x 2) = 16000 .... (iii)   Adding (i), (ii) and (iii), we get: 2(P + Q + R) = 42200 or P + Q + R = 21100 .... (iv)   (P+Q+R)'s monthly income = Rs. 21100.   Answer: 21100
<result>C</result>
The average monthly income of P and Q is Rs. 6050. The average monthly income of Q and R is Rs. 7050 and the average monthly income of P and R is Rs. 8000. The monthly income of P+Q+R is: