The average weight of A. B and Cis 80 kg. If D joins the group, the average weight becomes 84 kg. When E joins the group. the average weight becomes 3 kg more than the group, where D replaces A. Find the weight of A.
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Step-by-step explanation:
total weight of A,B,C = 80*3 = 240 kg
total weight of A,B,C,D = 84*4 = 336 kg
weight of D = 336 - 240 = 96 kg
total weight of A,B,C, D, E = 87*5 = 435 kg
total weight of B,C = 435 - 2*96 = 243 kg
weight of A = 3 kg
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