Two sections A and B have 36 and 44 students. Section A’s average weight is 40 kg B’s is 35 kg. What is the whole class’s average weight?

Two sections A and B have 36 and 44 students. Section A’s average weight is 40 kg B’s is 35 kg. What is the whole class’s average weight?
A: 30 Kg
B: 35 Kg
C: 37.25 Kg
D: None of these