The average of 12 numbers is x. When 5 is subtracted from each number, the average becomes 18. Later, three new numbers 10, 20 and (x + 10) are added to the original 12 numbers. Find the new average of all the numbers.

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.