In a class there are 50 students. Their average weight is 45 kg. When a student leaves the class, the average is reduced by 100 g. Find the weight of the student who left the class.

Find the mean weight of 20 students in your class.

The average weight of a class of 39 students is 40 kg. when a new student is admitted to the class, the averages decreases by 200 g. find the weight of the new student.

The average weight of 29 students is 28 kg. by the admission of a new student, the average weight is reduced to 27.8 kg. The weight of the new student is

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 weight of 29 students in a class is 48 kg. If the weight of the teacher is included, the average weight rises by 500 g. Find the weight of the teacher

In a class of 10 students the average age was 16 years. When two students left the class, the average age of the remaining students became 16.25 years. What is the total age of the students left