The average weight of 18 persons increases by 2.5 kg when a new person comes in place of one of them weighing 72 kg. The weight of the new person is:
Answer & explanation
Correct answer: option 3
Weight of new person = Weight of old person + Increment in age
Weight of new person = 72 + 18 × 2.5 = 72 + 45 = 117 kg