The average weight of 8 persons is increased by 2.5 kg, when a person whose weight is 56 kg, is replaced by a new comer. Find the weight of new comer?
Let N be the weight of the new comer. x be the average weight of persons. 
On solving, N = 76 kg Alternative Method After including the New comer total weight increased by = 2.5 × 8 = 20 kg i.e., the weight of the new comer = 56 + 20 = 76kg
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