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 been 65. How many papers were there in the examination ?

Answer 1

Answer:

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 ⇒ 2n = 22 ⇒ n = 11.

Answer 2

Step-by-step explanation:

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 ⇒ 2n = 22 ⇒ n = 11