the average weight of a b c is 45 kg if, Average, General Mathematics

Question:The average weight of A, B, C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, find the weight of the whole class.

Answer A + B + C = (45 x 3) kg =135 kg.
A + B = (40 x 2) =80 kg & B + C =(43 x 2) = 86 kg.
`:.` B = (A + B) + (B + C) - (A + B + C) = (86 + 80 - 135) kg = 31 kg.

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The average weight of A, B, C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, find the weight of the whole class.

Question:The average weight of A, B, C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, find the weight of the whole class.

Answer A + B + C = (45 x 3) kg =135 kg. A + B = (40 x 2) =80 kg & B + C =(43 x 2) = 86 kg. `:.` B = (A + B) + (B + C) - (A + B + C) = (86 + 80 - 135) kg = 31 kg.