The average weight of P Q R is 90 kg If the average weight of P Q be 60 kg and that of Q and R be 10......

The average weight of P, Q, R is 90 kg. If the average weight of P, Q be 60 kg and that of Q and R be 105 kg, What is the weight of Q?

Let P,Q and R represent their individual weights. then,
P+Q+R = (90x3) = 270kg
P+Q = (60x2) = 120kg
Q+R = (105x2) = 210kg
Q=(P+Q) + (Q+R) - (P+Q+R) = (120+210-270)kg = 60kg

By: bhavesh kumar singh