What will be the Number of Pupils in the Class? If

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. 10
  2. 20
  3. 40
  4. 73
Monis Rasool Professor Asked on 13th June 2015 in Maths.
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1 Answer(s)

Answer: (C) 40
Explanation:-

Let be the number of pupils in a class = X
Total increase in marks = (X x ½) = X/2
Therefore, X/2  = 83 – 63
X/2 = 20
X =  2 x 20 = 40

Hence. The answer is (C) 40

Anurag Mishra Professor Answered on 13th June 2015.
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