The average height of 35 telecom towers is 284 m. If the average height of the first 17 telecom towers is 284 m and that of the last 17 telecom towers is 286 m, then what is the height of the 18th telecom tower?

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.