The average weight of A, B, C is 40 kg, the average weight of B, D, E is 42 kg and the weight of F is equal to that of B. What is the average weight of A, B, C, D, E and F?
40.5 kg
40.8 kg
41 kg
Cannot be determined as data is inadequate
(A + B + C)/3 = 40 (given) => (A + B + C) = 120 ………(a) (B + D + E)/3 = 42 (given) => (B + D + E) = 126 ..……(b) F = B .…….(c) From equations (a) and (b), we get: A + B + C + B + D + E = 120 + 126 Or A + B + C + D + E + F = 246 (replacing one B with F as F = B from equation c) So, average weight of A + B + C + D + E + F = 246/6 = 41
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