The average age of 25 students of a class is 13 years. Out of them the average age of 15 students is 18 years. Find the average age of remaining students.

The average age of 15 students of a class is 15 years .Out of these the average age of 5 students is 14 years and that of the other nine students is 16 years . What is the age of the 15th student ?

3.The average age of 20 students in a class is 15 years. The average of 16 students is 12.What is the average age of remaining 4 students? A) 34, B) 45, C) 27, D) 26

The average age of 30 students in a class is 15 years. If 6 students of this class have the average age of 16 years, then the average age of the remaining 24 students would be (a) 14 years (b) 14 years 3 months (c) 14 years 6 months (d) 14 years 9 months

The average age of r boys in a class is a years. If the average age of s of them is b years, them what is the average age of the remaining boys ?

The average age of 30 students of a class is 30 years.When the average age of class teacher is also included the average age of the whole class increased by 1 year the age of the class teacher is: