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 D
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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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