A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:

1.

A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:

[A].	10
[B].	20
[C].	40
[D].	73

Answer: Option C

Explanation:

Let there be x pupils in the class.

Total increase in marks =		x x	1		=	x
			2			2

	x	= (83 - 63)	x	= 20 x= 40.
	2		2

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