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.

The average weight of 55 students is 55 kg , and the average weight of another 45 students is 45 kg . Find the average weight of all the students .

The average weigth of 25 students is 16 kg. The average weight of the first 12 students is 14 kg and of the last 12 students is 17 kg . Find the weight of the thirteenth students.

If the average weight of 6 students is 50 kg , that of 2 students is 51 kg and that of rest of 2 students is 55 kg , then the average weight of all the students is

The average weight of 100 students is 32 kg. The average weight of first 49 students is 30 kg and that of last 50 students is 34 kg. What is the weight (in kg) of the 50th student?

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 weight of a class of 40 students is 30 and the average weight of a class of 20 students is 15. Find the average weight of both the combined classes :