The 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 select one:
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Step-by-step explanation:
a+b+c=45
a+b=40__(1)
b+c=43____(2)
a=40-b
b=43-40-b
c=45-40-b-43-40-b
a+b+c=45
40-b+43-40-b+45-40-b-43-40-b=45
-4b+5-35=45
-4b-35=45
-4b=45+35
-b=80/4
-b=20
b=-20
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