The average age of 31 students in a group is 16 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 choice from the following options:
A) 31
B) 36
C) 48
D) 45
E) 57
age of the teacher=(32*17-31*16)= 
<gadget id="calculator">(32*17-31*16)</gadget>
<output>48</output>
48 years.   ANSWER:48
<result>C</result>
The average age of 31 students in a group is 16 years. when teacher's age is included to it, the average increases by one.What is the teacher's age in years?