If the average marks of three batches of 50, 60 and 70 students respectively is 65, 50 and 80, then the average marks of all the students is:

If the average marks of three batches of 50, 60 and 70 students respec

1.	If the average marks of three batches of 50, 60 and 70 students respectively is 65, 50 and 80, then the average marks of all the students is:
A.	66
B.	55
C.	62
D.	60
Answer» B. 55

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If the average marks of three batches of 50, 60 and 70 students respectively is 65, 50 and 80, then the average marks of all the students is:

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