Question

5.
The average weight of 3men A, B, C is 75kg. D join them
and the average weight of the 4 becomes 70 kg. If E whose
weight is 5 kg more than that of D. Replace A then the
average weight of B, C, D, E becomes 75 kg. The weight of
A?​

Answer 1

Answer:

Total weight of A + B + C = 84 x 3 = 252 kg

Total weight of A + B + C + D = 80 x 4 = 320 kg

∴ Weight of D = 320 - 252 = 68 kg

Given, E = D + 3 = (68 + 3) kg = 71 kg

Total weight of B + C + D + E = (79 x 4) kg = 316 kg

∴ Weight of B + C = 316 kg - 71 kg - 68 kg = 177 kg

Weight of A only = 320 kg - 177 kg - 68 kg = 75 kg

Here you go..

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