A pupil's marks were wrongly entered as 83 instead of 63. Due to that the averag

Question

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:

Options:

A . 10

B . 20

C . 40

D . 73

Answer: Option C

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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