The average age of 20 students in a class is 20. When the age of their class teacher commuted with the total age of students, their average age, including the class teacher's raises to 21. If so, what is the age of the class teacher?
A. 40
B. 36
C. 41
D. 44
Answer:C
The average age of 20 students in a class is 20. When the age of their class teacher commuted with the total age of students, their average age, including the class teacher's raises to 21. If so, what is the age of the class teacher?
A. 40 B. 36 C. 41 D. 44