The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students is 14 years and that of the other 9 students is 16 years. The age of the 15th student is____________?

A. 11 years
B. 14 years
C. 15 years
D. 15 2 / 7 years

A. 11 years
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