A pupil s marks were wrongly entered as 83 instead of…

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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-

  1. A. 10
  2. B. 20
  3. C. 40
  4. D. 73

Answer: Option C

Here is complete explanation of A pupil s marks were wrongly entered as 83 instead of….

Solution(By ExamCraze Team)

Let there be x pupils in the class
Total increase in marks
= x × $$frac{1}{2}$$
= $$frac{x}{2}$$
∴ $$frac{x}{2}$$ = (83 - 63)
⇒ $$frac{x}{2}$$ = 20
⇒ x = 40

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