The average age of 30 students of a class is 13 years. Out of them the average age of 18 students is 15 years. Find the average age of the 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 ?

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

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 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:

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 ?

There are 30 students in a class .The average age of the first 10 students is 12.5 years .The average age of the remaining 20 students is 13.1 years .What is the average age (in years ) of the students of the whole class ?