There are 2 sections A and B in a class, consisting of 40 and 20 students respectively. If the average weight of section A is 50kg and that of section B is 40kg, Find the average of the whole class?  Choose one.
A) 50.78kg B) 49.32kg C) 46.66kg D) 69.15kg E) 70.89kg
Total weight of 40+20 students = 40*50 + 20*40 = 2000+800= 
<gadget id="calculator">2000+800</gadget>
<output>2_800</output>
2800/60= 46.66 kg   Answer is 46.66kg
<result>C</result>
There are 2 sections A and B in a class, consisting of 40 and 20 students respectively. If the average weight of section A is 50kg and that of section B is 40kg, Find the average of the whole class?