The average of 35 students in a class is 17 years. The average age of 25 students is 15. What is the average age of remaining 10 students?
Choose one.
A) 26 years  B) 27 years  C) 28 years  D) 29 years  E) 30 years
Sum of the ages of 14 students   = (17 * 35) - (15 * 21) = 595 - 315= 
<gadget id="calculator">595 - 315</gadget>
<output>280</output>
280   Required average= (280/10)= 
<gadget id="calculator">(280/10)</gadget>
<output>28</output>
28 years.   Answer:28 years
<result>C</result>
The average of 35 students in a class is 17 years. The average age of 25 students is 15. What is the average age of remaining 10 students?