If the average marks of three batches of 40, 50 and 60 students respectively is 45, 55, 65, what is the average marks of all the students? Select the correct option
A) 56.33 B) 34.89 C) 23.67 D) 54.65 E) 43.98
56.33verage marks of batch1 = 45   Students in batch1 = 40   Total marks of batch1 = 40*45   56.33verage marks of batch2 = 55   Students in batch2 = 50   Total marks of batch2 = 50 × 55   56.33verage marks of batch3 = 65   Students in batch3 = 60   Total marks of batch3 = 65 × 60   Total students = 40 + 60 + 50= 
<gadget id="calculator">40 + 60 + 50</gadget>
<output>150</output>
150   56.33verage marks of all the students=((40*45)+(50×55)+(65×60))/150   =169/3   =56.333   56.33nswer is 56.33.
<result>A</result>
If the average marks of three batches of 40, 50 and 60 students respectively is 45, 55, 65, what is the average marks of all the students?