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

Solution(By Examveda Team)

Let the number of paper be x
Then, pupil's total score = 63x
∴ $$\frac{63x + 20 + 2}{x}$$   = 65
⇒ 2x = 22
⇒ x = 11