The average weight of 109 notebooks in a box is 10.9 kg. When a new notebook is added to the box, the average weight becomes 11 kg. Find the weight of the new notebook.

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.