The average weight of six persons is 30 kg. If a new person joins this group, then the average weight becomes 28 kg. What is the weight of the new person?

22 kg 14 kg 15 kg 16 kg

16 kg

Sum of weight of 6 persons = 6 × 30 = 180 kg After adding weight of new person ,  Sum of weight of 6 old persons and 1 new person = 7 × 28 196 kg Weight of New person = 196 - 180 = 16 kg