There were 24 students in a class One of them who…

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There were 24 students in a class. One of them, who was 18 years old, left the class and his place was filled up by a newcomer. If the average of the class thereby, was lowered by one month, the age of the newcomer is-

1. A. 14 years
2. B. 15 years
3. C. 16 years
4. D. 17 years

Answer: Option C

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