The average marks of a class of 35 students is 40 and that of another class of 45 students is 60. Find the average marks of all the students?
Pick:	A) 52.6	B) 52.4	C) 52.1	D) 51.2	E) 52.9
Sum of the marks for the class of 35 students = 35 * 40= 
<gadget id="calculator">35 * 40</gadget>
<output>1_400</output>
1400   Sum of the marks for the class of 45 students= 45 * 60= 
<gadget id="calculator">45 * 60</gadget>
<output>2_700</output>
2700   Sum of the marks for the class of 80 students=   1400 + 2700= 
<gadget id="calculator">1400 + 2700</gadget>
<output>4_100</output>
4100   Average marks of all the students= 4100/80 = 51.2.Answer: 51.2
<result>D</result>
The average marks of a class of 35 students is 40 and that of another class of 45 students is 60. Find the average marks of all the students?