Average weight of 10 persons is 40 kg. A new person join the group and average weight of 11 persons becomes 42 kg. What will be the weight of new person?

58 kg 60 kg 62 kg 64 kg

62 kg

Sum of weight of 10 persons = 10 x 40 = 400 Sum of weight of 11 persons = 11 x 42 = 462 Weight of new person = 462 - 400 = 62 kg