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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:

10
20
40
73

Correct Answer: 40

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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