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?
Answer & explanation
Correct answer: option 4
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