Find the total average marks of all the students in 2 separate classes, if the average marks of students in the first class of 39 students is 45 and that of another class of 35 students is 70.
Choose the correct choice from the following:
A) 55.8  B) 51.8  C) 53.8  D) 56.8  E) 52.8
Sum of the marks for the class of 39 students = 39 * 45= 
<gadget id="calculator">39 * 45</gadget>
<output>1_755</output>
1755   Sum of the marks for the class of 35 students= 35 * 70= 
<gadget id="calculator">35 * 70</gadget>
<output>2_450</output>
2450   Sum of the marks for the class of 74 students=1755+2450= 
<gadget id="calculator">1755+2450</gadget>
<output>4_205</output>
4205   Average marks of all the students= 4205/74   = 56.8   Answer:56.8
<result>D</result>
Find the total average marks of all the students in 2 separate classes, if the average marks of students in the first class of 39 students is 45 and that of another class of 35 students is 70.