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?
Choose the most appropriate option:
A) 50.78kg
B) 49.32kg
C) 61.67kg
D) 70kg
E) 70.89kg
Total weight of 50+50 students = 50*60 + 50*80 = 3000+4000= 
<gadget id="calculator">3000+4000</gadget>
<output>7_000</output>
7000/100= 
<gadget id="calculator">7000/100</gadget>
<output>70</output>
70 kg   Answer is 70kg
<result>D</result>
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?