There are 2 sections A and B in a class, consisting of 40 and 30 students respectively. If the average weight of section A is 50kg and that of section B is 60kg, Find the average of the whole class? Choose the correct choice.
A) 50.78kg B) 49.32kg C) 61.67kg D) 69.15kg E) 54.28kg
Total weight of 40+30 students = 40*50 + 30*60 = 2000+1800= 
<gadget id="calculator">2000+1800</gadget>
<output>3_800</output>
3800/70= 54.28 kg   Answer is 54.28kg
<result>E</result>
There are 2 sections A and B in a class, consisting of 40 and 30 students respectively. If the average weight of section A is 50kg and that of section B is 60kg, Find the average of the whole class?