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 15 th students is :
Age of the 15th student = [15 x 15 - (14 x 5 +16 x 9)]
= 225 - 214 = 11 years
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