The average age of a class of 27 students is 10 years. If the teacher's age is included, the average is increased by 1. What is the age of the teacher?

The average age of a class of 27 students is 10 years. If the teacher'

1.	The average age of a class of 27 students is 10 years. If the teacher's age is included, the average is increased by 1. What is the age of the teacher?
A.	38
B.	27
C.	30
D.	42
Answer» B. 27