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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 |
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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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