The average age of 20 persons in a office is 15 years. Out of these, the average age of 5 of them is 14 years and that of the other 9 persons is 16 years. The age of the 15th person is?  Choose the correct choice from the following answers.
A) 79 B) 86 C) 95 D) 72 E) 80
Age of the 15th student = 20*15 - (14*5+16*9) =300-214= 
<gadget id="calculator">300-214</gadget>
<output>86</output>
86 years   Answer is 86
<result>B</result>
The average age of 20 persons in a office is 15 years. Out of these, the average age of 5 of them is 14 years and that of the other 9 persons is 16 years. The age of the 15th person is?