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. 10 B. 20 C. 40 D. 73 Answer: Option C
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Solution(By Apex Team)

Let there be x pupils in the class Total increase in marks $\begin{aligned}&=x\times\frac{1}{2}\\ &=\frac{x}{2}\\ &\therefore\frac{x}{2}=(83-63)\\ &\Rightarrow\frac{x}{2}=20\\ &\Rightarrow x=40\end{aligned}$

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