The average age of 15 students of a class is 15 years. Out of these, the average age of 7 students is 14 years and that of the other 7 students is 16 years. The age of the 15th student is	Choices:  A) 9 years  B) 11 years  C) 15 years  D) 21 years  E) 25 years
Solution   Age of the 15th student	=[15x15-(14x7+16x7)]   = (225 - 210)= 
<gadget id="calculator">(225 - 210)</gadget>
<output>15</output>
15 years.   Answer 15 years
<result>C</result>
The average age of 15 students of a class is 15 years. Out of these, the average age of 7 students is 14 years and that of the other 7 students is 16 years. The age of the 15th student is