Question

The average age of 14 girls and their teacher's age is 15 years. If the teacher's age is excluded, then the average is reduced by 1. What is the teacher's age?

• A. 29 years
• B. 35 years
• C. 32 years
• D. 30 years
• E. None of these

Answer 1

The correct option is A 29 years

Here, teacher's age = 15 - (1 - 15) $\times$ 1
= 15 - (-14)
= 15 + 14
= 29 years