The average age of 29 students in a class is 26 years. If the age of the teacher is also included, the average age of the class becomes 26.4 years. Find the age of the teacher?
Answer & explanation
Correct answer: option 2
Total age of 29 students = 29 × 26 = 754 years
Total age of 29 students + 1 teacher = 30 × 26.4 = 792 years
Age of teacher = 792 - 754 = 38 years