The number of students in a class is 60 . The average of the ages of the boy-students is 14.5 years and the average of the ages of the girl-students is 16 years . If the collective average of the total students be 15 years , then find the number of boy-students and the number of girl-students.

The average of the weights of 150 students is 50 kilogram. The average of the weights of the boy students is 55 kilograms and the average of the weigths of the girls students is 42.5 kilogram . Find the number of boy and girl students.

There are 25 boy students and 20 girls students in a school. The average of marks in math of 25 boy students is 52 and the average of marks in math of 20 girl-students is 48. Find the average of marks obtained by the students of the school as a whole.

Find the average height of the students from the given table.

Ages of some students are (in years) 10, 11, 9, 7, 13, 8, 14 the median of the ages of those students is _________ years.

If the age of some students are 6,10,5,4,9,11,20,18 years, then their mean age is

A teacher on attempting to arrange the students for mass drill in the form of a solid square found that 24 students were left over. When he increased the size of the square by one student he found he was short of 25 students. Find the number of students?

The average of the collective ages of 4 classes in a school is 8.5 years. The number of students of 4 classes are 32.30, 29 and 27. If the average of the classes of the first, second and third be 6.8 years, 7.5 years and 8.2 years respectively , then find the average of ages of the students of class-IV.

In a class of 100 students there are 70 boys whose average marks in subject are 75. If the average marks of the complete class are 72, then the average marks of the girls

As a result of sarba Siksha Abhiyan, the students leaving the school before completion, the students are readmitted, so the students in a year is increased by 5% in comparison to its previous year. If the number of such readmitted students in a district be 3,528 in the present year, then find the number of students readmitted 2 year before in this manner.