Question

the average of class teacher and 10 student in a class is 25 years which is reduced by 2 years if the age of the class teacher is excluded. what is age of class teacher?​

Answer 1

Answer:

45 Yrs.

Step-by-step explanation:

Average age of teacher + 10 students i.e. 11 = 25

Total age of teacher + students = 25*11 = 275.

Average age of 10 students (excluding teacher)  = 25-2 = 23

Total age of 10 students = 230.

Age of teacher = 275 - 230 - 45.