The average weight of 12 persons increases by 3.5 kg when a new person comes in place of one of them weighing 58 kg. The weight of the new person is
Increase the average weight of 12 persons = 3.5kg Increase the total weight of 12 persons = 3.5×12= 42kg So now the weight of the new person = 58 + 42 = 100kg
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