Question

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 65. How many papers were there in the examination ?

• A. 8
• B. 9
• C. 10
• D. 11

Answer 1

The correct option is D 11

Let there be n papers in all.
Total marks originally for n papers = 63n
Total marks with increased average = 65n
Given, 65n - 63n = 20 + 2 $\Rightarrow$ 2n = 22 $\Rightarrow$ n = 11.