When a class of 40 students took a science test, 25 students had an average score of 80, and the remaining students had an average score of 90. What was the average score of the whole class?

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.