Question

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?

• A. 38 years
• B. 36 years
• C. 37 years
• D. 35 years

Answer 1

Answer:

C. 37 years

The sum of the age of 10 students and their teacher is = 11 × 17 = 187 years The sum of the age of 10 students = 10 × (17 – 2) = 150 The age of teacher = 187 – 150 = 37