The average age of 35 students in a class is 16 years. The average age of 21 students is 14. What is the average age of remaining 7 students?	Choose the correct choice.
A) 14 years B) 17 years C) 19 years D) 38 years E) None
Solution   Sum of the ages of 14 students	= (16 x 35) - (14 x 21)   = 560 - 294.= 
<gadget id="calculator">560 - 294.</gadget>
<output>266</output>
266.   ∴ Required average= 266 / 7= 
<gadget id="calculator">266 / 7</gadget>
<output>38</output>
38 years.   Answer 38 years
<result>D</result>
The average age of 35 students in a class is 16 years. The average age of 21 students is 14. What is the average age of remaining 7 students?