In Class I there are 10 students with an average weight of 20 kg and in Class II there are 20 students with an average weight of 20 kg. What is the average weight (in kg) of all the students in both classes combined?

What is the average number of students in B.Tech (220), M.Tech (140), and B.A (4344) courses together?

A class has two sections A and B, which have 36 and 44 students respectively. If the average weight of section A is 40 kg and that of section B is 35 kg, find the average weight of the whole class.