He average weight of a, b and c is 45 kg. if the average weight of a and b be 40 kg and that of b and c be 43 kg, then the weight of b is:
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a +b+C =45×3=135
a+b =40×2 =80
b+C=43×2=86
b =80+86-135=31
a+b =40×2 =80
b+C=43×2=86
b =80+86-135=31
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