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Let us assume the total boys in the group be 'b' The sum of the weight of the all-boys = 44b 42b = 44b - 50 + 40 42b = 44b - 10 44b - 42b = 10 2b = 10 b = 5
5, 5, 15, 75, ?, 4725
8, 24, 48, 80, ?, 168
8 13 36 123 ? 2585
250, 279, 311, 349, 396, ?
840, 2520, 630, 3150, ?, 3675
12, 24, 46, 78, 120, ?
81, 41, 42, 64.5, ?, 330
8, 58, 75, 94, 115, ?
200 ? 96 38.4 7.68 0