The average weight of 8 persons increases by 1.5 kg when a person weighing 65 kg is replaced by a new person; the weight of the new person is equal to (A) 76 kg (B) 77 kg (C) 76.5 kg (D) 77.5 kg
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Answer:
Total weight increased = ( 8 X 1.5 )kg = 12 kg.
Weight of new man = 65 + 12 = 77 kg
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