There are two sections X and Y of a class, consisting of 72 and 88 students respectively. If the average weight of sections X is 80 kg and that of sections Y is 70 kg. Find the average weight of the whole class  Choose the correct answer
A) 70.5
B) 72.5
C) 73.5
D) 74.5
E) None
Solution   Total weight of(72+88)Students	= (72x80+88x70)Kg   = 11920 kg.   Average weight of the whole class	= (11920 / 160)   = 74.50.   Answer 74.5
<result>D</result>
There are two sections X and Y of a class, consisting of 72 and 88 students respectively. If the average weight of sections X is 80 kg and that of sections Y is 70 kg. Find the average weight of the whole class