The average age of 36 students in a group is 14 years. When teacher's age is included to it, the average increases by one. What is the teacher's age in years ?
Choose the correct option:
A) 81 years
B) 21 years
C) 51 years
D) 31 years
E) 61 years
Age of the teacher   = (37 * 15 - 36 * 14)= 
<gadget id="calculator">(37 * 15 - 36 * 14)</gadget>
<output>51</output>
51 years.   Answer: 51 years
<result>C</result>
The average age of 36 students in a group is 14 years. When teacher's age is included to it, the average increases by one. What is the teacher's age in years ?