The average age of 29 students of the class and their teacher is 14 years. When the teacher's age is excluded, the average age of the student decreases by 1 year. What is the age (in years) of the teacher?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 43.
Total age of 29 students and 1 teacher = 14 × 30 = 420
Total age of 29 students = 13 × 29 = 377
Age of teacher = 420 - 377 = 43