The average age of a class was 15 years. When 5 more boys, whose average age was 12 years 6 months, were admitted in the class, the average age of the whole class was reduced by 6 months. How many students were there in the class originally?

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The average age of a class was 15 years. When 5 more boys, whose average age was 12 years 6 months, were admitted in the class, the average age of the whole class was reduced by 6 months. How many students were there in the class originally?

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The average age of a class was 15 years. When 5 more boys, whose average age was 12 years 6 months, were admitted in the class, the average age of the whole class was reduced by 6 months. How many students were there in the class originally?

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