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ATQ, (d – 30 + d + d + 30)/{(d – 30)/12 + (d/30) + (d + 30)/24} = 20 Or, 3d/{(19d – 150)/120} = 20 Or, 18d = 19d – 150 Or, d = 150
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