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 one.
A) 31
B) 41
C) 51
D) 61
E) 71
Solution   Age of the teacher	= (37 x 15 - 36 x 14)   = 51 years.   Answer 51
<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?