a pupil's marks were wrongly entered as 83 instead of 63. due to that the aver

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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 :

Options:

A . 45

B . 40

C . 39

D . 37

Answer: Option B
Explanation :

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