Question

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

Answer 1

Average age of 15 people = 15*15 = 225 years

Average age of 14 people (excluding teacher) = 14*14 = 196

225-196 = 29 years is the age of teacher