The average age of 12 students is 14 years. If the age of the teacher is also included, the average becomes 15 years. What is the age of the teacher?
Answer & explanation
Correct answer: option 3
Sum of age of 12 students = 12 × 14 = 168 years
After adding age of teacher
Sum of Age of 12 students + 1 teacher = 13 × 15 = 195 years
Age of teacher = 195 - 168 = 27 years