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 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 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

If the average age of 40 students in class I is 10 yr and the average age of 30 students in class II is 12 yr, then find the average age (in years) for all students. (A) 11 (B) 10.54 (C) 10.58 (D) 10.85

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 40 students is 20 yr, if age of each student is multiplied by 2, what will be the new average?