The average weight of 3 packets A, B and C is 84 kg. Another packet D added into the group and the average now becomes 80 kg. If another packet E, whose weight is 3 kg more than that of D, replaces A then the average weight of B, C, D and E becomes 79 kg. The weight of A is:
A+B+C = (84x3) = 252kg, A+B+C+D=(80x4) = 320kg.
D = (320 - 252) = 68 , E = (68+3) =7l.
B+C+D+E = (79x4)=316.
(A+B+C+D) -(B+C+D+E)=(320 - 316)kg = 4kg.
A - E = 4 = A = (4+E)=75kg
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