In an examination, a pupil's average marks were 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 ?

In an examination, a pupil's average marks were 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 15

C 19

D 11

Solution

Correct Answer: Option D

Let the number of papers be x. Then, 63x + 20 + 2 = 65x or 2x = 22 or x = 11.