- 76 Years
- 72 Years
- 78 Years
- None of these

Answer is correct but not unit. The average weight of 8 persons increases by 2.5 kg, Total weight of 8 persons increased= 8 × 2.5 kg = 20 kg. New person comes in place of one of them weighing 56 kg. Weight of new person = 56 + 20 kg = 76 kg