In an examination, a pupil’s average mark was 63 per paper. If he had obtained 20 more marks for his Geography paper and 2 more marks for his History paper, his average per paper would have been 65. How many papers were there in the examination?
A. 8 B. 9 C. 10 D. 11 Answer: Option DShow Answer
Solution(By Apex Team)
$\begin{array}{l}\text{Let the number of paper be x}\\
\text{Then, pupil’s total score = 63x}\\
\begin{aligned}&\therefore\frac{63x+20+2}{x}=65\\
&\Rightarrow2x=22\\
&\Rightarrow x=11\end{aligned}\end{array}$
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