If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, what is the average marks of all the students? Pick.
A) 54.68	B) 54	C) 45.68	D) 45	E) 55
54.68verage marks of batch1 = 50   Students in batch1 = 55   Total marks of batch1 = 55 × 50   54.68verage marks of batch2 = 55   Students in batch2 = 60   Total marks of batch2 = 60 × 55   54.68verage marks of batch3 = 60   Students in batch3 = 45   Total marks of batch3 = 45 × 60   Total students = 55 + 60 + 45= 
<gadget id="calculator">55 + 60 + 45</gadget>
<output>160</output>
160   54.68verage marks of all the students=((55×50)+(60×55)+(45×60))/160   =(275+330+270)/16   =875/16   =54.68   54.68nswer is 54.68.
<result>A</result>
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, what is the average marks of all the students?