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What is the correct answer?

4

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is

A. 54.48

B. 54.68

C. 54.60

D. 54.58

Please do not use chat terms. Example: avoid using "grt" instead of "great".