The average marks of a class of 30 students is 50 and that of another class of 50 students is 60. Find the average marks of all the students?	Options:
A) 56.25 B) 52.9 C) 52.1 D) 52.3 E) 42.5
Sum of the marks for the class of 30 students = 30 * 50= 
<gadget id="calculator">30 * 50</gadget>
<output>1_500</output>
1500   Sum of the marks for the class of 50 students= 50 * 60= 
<gadget id="calculator">50 * 60</gadget>
<output>3_000</output>
3000   Sum of the marks for the class of 80 students=   1500 + 3000= 
<gadget id="calculator">1500 + 3000</gadget>
<output>4_500</output>
4500   56.25verage marks of all the students= 4500/80= 
<gadget id="calculator">4500/80</gadget>
<output>225/4 = around 56.25</output>
56.25   56.25nswer:56.25
<result>A</result>
The average marks of a class of 30 students is 50 and that of another class of 50 students is 60. Find the average marks of all the students?