Multiple choice

The average weight of A, B, C is 84 kg. If the weight of D is added, the average weight becomes 80 kg. If another person E, whose weight is 3 kg more than D, comes in place of A, then the average weight of B, C, D, E becomes 79 kg. Find the weight of A?

  1. 75

  2. 78

  3. 72

  4. 74
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A + B + C = 3 × 84 = 252 kg. Adding D: A + B + C + D = 4 × 80 = 320 kg. So D = 320 - 252 = 68 kg. E = D + 3 = 71 kg. Also, B + C + D + E = 4 × 79 = 316 kg. So B + C = 316 - 68 - 71 = 177 kg. Therefore, A = 252 - 177 = 75 kg.

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