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:

1.

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].	53.33
[B].	54.68
[C].	55
[D].	None of these

Answer: Option B

Explanation:

Required average

=		55 x 50 + 60 x 55 + 45 x 60
		55 + 60 + 45

=		2750 + 3300 + 2700
		160

=	8750
	160

= 54.68

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