Arithmetic Aptitudes › Average › Question #4578
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QFind the weight of B given that the average weight of A, B, and C is 45 kg, the average weight of A and B is 40 kg, and the average weight of B and C is 43 kg.

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  • A 31 ✔ ✖
  • B 34 ✔ ✖
  • C 32 ✔ ✖
  • D 33 ✔ ✖
Correct Answer: Option A

Explanation


Let A, B, and C represent their individual weights.
Then:

A + B + C = 45 kg * 3 = 135 kg
A + B = 40 kg * 2 = 80 kg
B + C = 43 kg * 2 = 86 kg

B = (A + B) + (B + C) - (A + B + C) = (80 kg + 86 kg - 135 kg) = 31 kg
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