The average age of 15 students of a class is 15 years. Out of these, the average age of 4 students is 14 years and that of the other 10 students is 16 years. The age of the 15th student is
Choose one
A) 9 years B) 11 years C) 14 years D) 21 years E) 9 years
Solution   Age of the 15th student	=[15x15-(14x4+16x10)]   = (225 - 216)= 
<gadget id="calculator">(225 - 216)</gadget>
<output>9</output>
9 years.   Answer 9 years
<result>E</result>
The average age of 15 students of a class is 15 years. Out of these, the average age of 4 students is 14 years and that of the other 10 students is 16 years. The age of the 15th student is