The average weight of a group of five persons, A, B, C, D, and E is 78 kg. If another person K joins the group then the average weight of the group is decreased by 7.5 kg, then find the weight of K.
Total weight of A, B, C, D, and E together = 78 × 7.5 = 390 kg Weight of K = 70.5 × 6 – 390 = 423 – 390 = 33 kg
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