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 ? Choose the correct choice from the following choices
A) 12	B) 27	C) 26	D) 11	E) 22
Let the number of papers be x. Then, 63x + 20 + 2 = 65x or 2x   = 22 or x   = 11.   Answer: 11
<result>D</result>
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 ?