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.

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 mean weight of 25 students of a class is 48 kg. If the mean weight of first 13 students is 50 kg and the last 13 students is 46 kg. Find the weight of the 13th students?

The mean weight of 25 students of a class is 52 kg. if the mean weight of the first 13 student of the class is 48 kg and that of the last 13 students is 55kg , find the weight of the 13th student.

The mean weight of 20 students is 25 kg and the mean weight of another 10 students in 40 kg . Find the mean weight of the 30 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 .

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 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.

If the average weight of the students of a class is 15kg, the average weight of the students of another class is 30kg and average weight of the students of both the classes is 25kg, then find the ratio of the number of students of the first class to the another class.