The average age of a class of 12 students is 19 years. The average increased by 2 when the teacher's age also included. What is the age of the teacher?  Choose the correct answer
A) 40 years
B) 34 years
C) 42 years
D) 43 years
E) 44 years
If age of the teacher was 12, average would not have changed.   Since average increased by 2,   Age of the teacher=12+22×1=34   ANSWER:34 years
<result>B</result>
The average age of a class of 12 students is 19 years. The average increased by 2 when the teacher's age also included. What is the age of the teacher?