The average age of 10 students and their class teacher is 17 years. If the age of the class teacher is excluded, the average age of the 10 students is reduced by 2 years.
What is the age of the class teacher?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 37 years
Given that
The average age of 10 students and their class teacher is 17 years
If the age of class teacher is exclude then the average of 10 students will be = 17 - 2 = 15 years
Let the age of a class teacher be T
According to the question
The age of the teacher T = 11 × 17 - 15 × 10 = 187 - 150 = 37 years