The average age of a class of 22 students is 21 years. The average increased by 1 when the teacher's age also included. What is the age of the teacher?
Choose the correct answer:	A) 40	B) 41	C) 44	D) 42	E) 43
Total age of all students =22×21   Total age of all students + Age of the teacher =23×22   Age of the teacher   =23×22−22×21=22(23−21)=22×2=44   Answer is 44.
<result>C</result>
The average age of a class of 22 students is 21 years. The average increased by 1 when the teacher's age also included. What is the age of the teacher?