As the age of star increases

The average age of 30 boys in a class is 15 years. If we include the age of two teachers the average age increases by 1. Find the sum of ages of the two teachers.

The average age of 6 members of a family is 20 years. If the age of the servant is included, the average age increases by 25% . What is the age (in years) of the servant ?

The average age of 12 players is 25 years. If the age of thecaptain be included, then the average age increases by 1years. Find the age of Captain

The average age of 4 members of a family is 25 yr . If head of the family is included in this group , then average age increases by 20% . Find the out the age of the head

The average age of 5 marks members of a family is 25yr . If the servant of the family is included , the average age increases by 40%. What is the age of servant ?

Average age of a team having 12 players is 23 years. If the age of the coach is also included, then the average age increases by 2 years. What is the age (in years) of the coach ?