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?

Q. The average age of $24$ boys and a teacher is $15$ . When the teacher' age is excluded the average decreases by $1$. What is the age of the teacher?

Q. The average age of $5$ teachers is $28$ years. If one teacher is excluded the mean gets reduced by $2$ years. The age of the excluded teacher is ___________.

Q. The average age of a class of 50 students increases by 1 year if the age of the teacher is included. If the age of the teacher is 61 years, what is the average age of the class excluding the teacher?

Q. The average age of $29$ boys of a class is equal to $14$ years. When the age of the class teacher is included the average becomes $15$ years. Find the age of the class teacher.

Q. A school has $20$ teachers, one of them retires at the age of $60$ years and a new teacher replaces him. This change reduces the average age of the staff by $2$ years. Then the age of new teacher is: