The total number of characters introduced in Chapter One of a book is 8, which is given by the expression (x - 20), and the total number of characters in Chapter Three is 48, given by the expression (y + 8). Calculate the average value of x and y.

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.