Correct option (c) 50 kg
Explanation:
The average weight of 9 persons is 50 kg.So, total weight of all the persons = 50 × 9 = 450 kg
The average weight of the first 5 persons is 45 kg.So, their total weight = 45 × 5 = 225 kg
The average weight of the last 5 persons is 55 kg.So, their total weight = 55 × 5 = 275 kg
The fifth person has been included in both the last cases.
Hence, the weight of the fifth person = (275 + 225) – 450 = 50 kg
