If the average marks of three batches of 55, 60 and 45 students respectively is 40, 55, 60, then the average marks of all the students is: Choose the correct answer: A) 51.25 B) 54.68 C) 55 D) 56 E) None of these
Explanation:   Required average = (55 × 40 + 60 × 55 + 45 × 60/55 + 60 + 45)   = (2200 + 3300 + 2700/160)   = 8200/160= 
<gadget id="calculator">8200/160</gadget>
<output>205/4 = around 51.25</output>
51.25   51.25nswer: 51.25
<result>A</result>
If the average marks of three batches of 55, 60 and 45 students respectively is 40, 55, 60, then the average marks of all the students is: