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:	Choose the correct choice from the following answers
A) 32
B) 50
C) 40
D) 20
E) 10
Let there be x pupils in the class.   Total increase in marks = x x 1/2 = x/2   x/2 = (83 - 63)   x/2	= 20   x= 40.   Answer: 40
<result>C</result>
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: