There are three sections A, B and C of class 12th. If the number of students in section A, B and C are 95, 209 and 171 respectively and the average marks of sections A, B and C in an exam are 83, 78 and 85 respectively, what are the overall average marks of Class 12th?

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.