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There were 24 students in a class. On...

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 (a) 14 years    (b) 15 years    (c) 16 years    (d) 17 years

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