The average weight of P, Q and R is 71 kg. If the average weight of P and Q be 66 kg and that of Q and R be 76.5 kg, then the weight (in kg) of Q is.
Total Weight of P,Q & R= $$(P+Q+R)\div3=71$$
Therefore,P+Q+R= 213 Â Â Â ......(i)
Total weight of P & Q= $$(P+Q)\div2=66$$
Therefore, P+Q= 132 Â Â Â Â .......(ii)
Total weight of Q & R= $$(Q+R)\div2=76.5$$
Therefore,Q+R= 153 Â Â Â Â .......(iii)
Solving equation (i) & (ii), we get, R= 81
Solving equation (i) & (iii), we get, P= 60
Putting the value of P & R in equation (i),
We get, Q= 72.
Therefore, Option B is the correct answer.
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