A pupil 39 s marks are wrongly entered as 83 instead of 63 Due to that the average marks of the clas...........

Quantitative Aptitude ( CCS) Average

A pupil's marks are wrongly entered as 83 instead of 63. Due to that the average marks of the class got increased by half. The number of pupils in the class is ?

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Explanation:

Let the total number of students = xx
The average marks increased by 1/2 due to an increase of 83 - 63 = 20 marks.
But total increase in the marks = 1/2 × x = x/2
Hence we can write as
x/2 = 20, x = 20×2 = 40

Hence, option 3 is the correct answer.