Question

Q. 3. The weight of four students of
class 4 is 27, 23, 28 and 30 kg respectively.
Find the average weight.
Sol Average weight per student​

Answer 1

Step-by-step explanation:

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

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