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Multiple choice

The average weight of X, Y and Z is 45 kg. If the average weight of X and Y be 40 kg and that of Y and Z be 43 kg, then the weight of Y is:

  1. 31 kg

  2. 26 kg

  3. 59 kg

  4. 46 kg

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A Correct answer
Explanation

X+Y+Z = 45×3 = 135. X+Y = 40×2 = 80. Y+Z = 43×2 = 86. Y = (X+Y) + (Y+Z) - (X+Y+Z) = 80 + 86 - 135 = 31 kg.

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