The average weight of A,B,C is 45kg.If the average weight of A & B be 40kg and that of B & C be 43kg,then the weight of B is
A)17kg B)20kg C)26kg D)31kg
Answer: D
Description:
We have
(A+B+C)/3=45
then A+B+C=45*3=135----------(1)
as like we having
(A+B)=40*2=80
(B+C)=43*2=86
Adding above two equations we get
A+2B+C=166----------------------(2)
Solving (1) and(2)
we get B=31...
A)17kg B)20kg C)26kg D)31kg
Answer: D
Description:
We have
(A+B+C)/3=45
then A+B+C=45*3=135----------(1)
as like we having
(A+B)=40*2=80
(B+C)=43*2=86
Adding above two equations we get
A+2B+C=166----------------------(2)
Solving (1) and(2)
we get B=31...
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