There are 2 sections A and B in a class, consisting of 36 and 24 students respectively. If the average weight of section A is 30kg and that of section B is 30kg, Find the average of the whole class?	Choose the correct choice from the following choices.
A) 30 kg  B) 37 kg  C) 42 kg  D) 55.12 kg  E) 29.78 kg

Rationale: "total weight of 36 + 44 students = 36 * 30 + 24 * 30 = 1800 average weight of the class is = 1800 / 60 = 30 kg answer is a"
Answer: A