the avergae wt. a,b,c is 45 kg . if the avg. wt of a and b be 40 kg and that e and c be 43 kg the the wt of b is.
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Average weight of abc = 3 x 45 = 135
Average weight of AB = 40 x 2 = 80
Average weight of BC = 43 x 2 = 86
AB + BC = 166
Average weight of (AB+BC) - abc = 166 - 135 = 31
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