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. The number of pupils in the class is

Virat Bhati • 7.23K Points
Tutor III Math

Q. 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. The number of pupils in the class is

(A) 45
(B) 40
(C) 39
(D) 37

Correct Answer - Option(B)

Explanation by: Virat Bhati

Let there be x pupils in the class.
Total increase in marks = (x * 1/2) = x/2.
x/2 = (83 - 63) => x/2 = 20 => x = 40.

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