Three years ago, the average age of a husband, his wife, and their two daughters was 28 years. Five years ago, the average age of the wife and the two daughters was 20 years. What is the husband's present age (in years)?

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.