The average marks of a class of 22 students is 40 and that of another class of 28 students is 60. Find the average marks of all the students?  Choose one:
A) 51.2
B) 59.5
C) 52.8
D) 52.5
E) 52.1
Sum of the marks for the class of 22 students = 22 * 40= 
<gadget id="calculator">22 * 40</gadget>
<output>880</output>
880   Sum of the marks for the class of 28 students= 28 * 60= 
<gadget id="calculator">28 * 60</gadget>
<output>1_680</output>
1680   Sum of the marks for the class of 50 students=   880 + 1680= 
<gadget id="calculator">880 + 1680</gadget>
<output>2_560</output>
2560   51.2verage marks of all the students= 2560/50= 
<gadget id="calculator">2560/50</gadget>
<output>256/5 = around 51.2</output>
51.2   51.2nswer:51.2
<result>A</result>
The average marks of a class of 22 students is 40 and that of another class of 28 students is 60. Find the average marks of all the students?