There are 2 sections A and B in a class, consisting of 60 and 70 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?
Choose one:
A) 50.78kg
B) 49.32kg
C) 70.76kg
D) 69.15kg
E) 70.89kg
Total weight of 60+70 students = 60*60 + 70*80 = 3600+5600= 
<gadget id="calculator">3600+5600</gadget>
<output>9_200</output>
9200/130= 70.76 kg   Answer is 70.76kg
<result>C</result>
There are 2 sections A and B in a class, consisting of 60 and 70 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?