1.

Suppose the average weight of 9 persons is 50 kg. The average weight of the first 5 persons is 45 kg, whereas the average weight of the last 5 persons is 55 kg. Then the weight of the 5th person will be (a) 45 kg (b) 47.5 kg (c) 50 kg (d) 52.5 Kg

Answer»

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



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