### 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 $\frac{1}{2}$ . The number of pupils in the class is:

**A.** 10

**B.** 20

**C.** 40

**D.** 73

## Show Answer

###
Answer-C

Solution-

__Solution(By Apex Team)__

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