There are 2 sections A and B in a class, consisting of 50 and 50 students respectively. If the average weight of section A is 60kg and that of section B is 80kg, Find the average of the whole class?
Answers:	A) 50.78 kg	B) 49.32 kg	C) 61.67 kg	D) 70 kg	E) 70.89 kg

Rationale: "total weight of 50 + 50 students = 50 * 60 + 50 * 80 = 3000 + 4000 average weight of the class is = 7000 / 100 = 70 kg answer is d"
Answer: D