1. The average weight of P, Q and R is 47 kg. If the average weight of P and Q be 32.5 kg and that of Q and R be 48.5 kg, then what is the weight of Q (in kgs)?
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- By: anil on 05 May 2019 01.45 am$$frac{P+Q+R}{3}=47 ightarrow P+Q+R = 47 imes 3 = 141$$ -------(1) $$frac{P+Q}{2}=32.5 ightarrow P+Q = 32.5 imes 2 = 65$$ -------(3) $$frac{Q+R}{2}=48.5 ightarrow Q+R = 48.5 imes 2 = 97$$ -------(3) (2)+(3)-(1)$$Rightarrow P+Q+Q+R-P-Q-R = 65+97-141=21$$ $$Rightarrow Q = 21$$ So the answer is option B.
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