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 CShow Answer
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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