The average marks of a class of 40 students is 44 and that of another class of 45 students is 70. Find the average marks of all the students?	Choose the correct choice from the following answers:
A) 52.6
B) 52.4
C) 52.1
D) 69.5
E) 52.9
Sum of the marks for the class of 40 students = 40 * 44= 
<gadget id="calculator">40 * 44</gadget>
<output>1_760</output>
1760   Sum of the marks for the class of 45 students= 45 * 70= 
<gadget id="calculator">45 * 70</gadget>
<output>3_150</output>
3150   Sum of the marks for the class of 85 students=   2760 + 3150= 
<gadget id="calculator">2760 + 3150</gadget>
<output>5_910</output>
5910   Average marks of all the students= 5910/85 = 69.5.Answer: 69.5
<result>D</result>
The average marks of a class of 40 students is 44 and that of another class of 45 students is 70. Find the average marks of all the students?