The average marks of a class of 24 students is 40 and that of another class of 50 students is 60. Find the average marks of all the students?
Answers: A) 52.2 B) 59.5 C) 52.8 D) 53.5 E) 52.1
Sum of the marks for the class of 24 students = 24 * 40= 
<gadget id="calculator">24 * 40</gadget>
<output>960</output>
960   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 74 students=   960 + 3000= 
<gadget id="calculator">960 + 3000</gadget>
<output>3_960</output>
3960   Average marks of all the students= 3960/74   = 53.5   Answer:53.5
<result>D</result>
The average marks of a class of 24 students is 40 and that of another class of 50 students is 60. Find the average marks of all the students?