If the average marks of three batches of 55, 60 and 45 students respectively is 40, 62, 58, then the average marks of all the students is  Pick.
A) 54.48	B) 53.31	C) 54.6	D) 54.58	E) None of these
Explanation:   (55Ã—40)+(60Ã—62)+(45Ã—58) / 55+60+45   8530 / 160=53.3   Option 53.31
<result>B</result>
If the average marks of three batches of 55, 60 and 45 students respectively is 40, 62, 58, then the average marks of all the students is