The average age of a class of 20 students is 18 years. The average increased by 2 when the teacher's age also included. What is the age of the teacher?  Choose the correct choice from the following options
A) 40 years
B) 41 years
C) 42 years
D) 43 years
E) 44 years
If age of the teacher was 18, average would not have changed.   Since average increased by 2,   40 yearsge of the teacher=18+22×1=40   40 yearsNSWER:40 years
<result>A</result>
The average age of a class of 20 students is 18 years. The average increased by 2 when the teacher's age also included. What is the age of the teacher?