The average age of a class of 15 students is 10 years. If the age of the teacher be included, then the average increased by 1year. Find the age of the teacher? Answers:
A) 22
B) 23
C) 26
D) 29
E) 31
Total age of 15 persons = 15*10= 
<gadget id="calculator">15*10</gadget>
<output>150</output>
150 years   Average age of 16 persons= 11years   Total age of 16 persons = 16 * 11= 
<gadget id="calculator">16 * 11</gadget>
<output>176</output>
176 years   Age of the teacher= 176-150= 
<gadget id="calculator">176-150</gadget>
<output>26</output>
26 years   Answer is 26
<result>C</result>
The average age of a class of 15 students is 10 years. If the age of the teacher be included, then the average increased by 1year. Find the age of the teacher?