Multiple choice

The average weight of A, B and C is 66 kg. If D joins the group, then the average weight of the group becomes 70 kg. If another man E, whose weight is 4 kg more than D, replaces A, then the average of B, C, D and E becomes 76 kg. How much does A weigh?

  1. 62 kg

  2. 65 kg

  3. 72 kg

  4. 86 kg
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A Correct answer
Explanation

A+B+C = 66*3 = 198. A+B+C+D = 70*4 = 280. D = 280 - 198 = 82. E = D+4 = 86. B+C+D+E = 76*4 = 304. B+C+82+86 = 304. B+C = 304 - 168 = 136. A = (A+B+C) - (B+C) = 198 - 136 = 62.

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