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The average age of 30 students in a c...

The average age of 30 students in a class is 15 years. If 6 students of this class have the average age of 16 years, then the average age of the remaining 24 students would be (a) 14 years                       (b) 14 years 3 months (c) 14 years 6 months       (d) 14 years 9 months

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