The average weight of A, B and C is80 kg. If D joins the group, theaverage weight becomes 84 kg.When E joins the group, theaverage weight becomes 3 kg morethan the group, where D replacesA. Find the weight of A. (RKM, 2005)
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Step-by-step explanation:
A + B + C = 84 * 3 = 252
A + B + C + D = 80 * 4 = 320
D = (A + B + C + D) - ( A + B + C) = 320 - 252 = 68.
E = D + 3 = 68 + 3 = 71.
B + C + D + E = 316.
B + C + D + 71 = 316.
B + C + D = 245.
We know,
A + B + C + D = 320
A + 245 = 320
A = 75.
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