The average age of 35 students in a group is 12 years. When the teacher's age is included, the average increases by one. What is the teacher's age?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 48 years.
Average age of 35 students = 12 years
Total age of 35 students = 35 × 12 = 420 years
New average with teacher = 13 years
Total people = 36
Total age = 36 × 13 = 468
Teacher's age = 468 - 420 = 48 years