In an examination a pupil's average marks were 63 per paper. If he had obtained 18 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?
Select the correct option:
A) 8	B) 9	C) 10	D) 11	E) 12
Let the number of papers be x. Then,   63x + 18 + 2 = 65x   = 2x = 20   = x = 10.   ANSWER:10
<result>C</result>
In an examination a pupil's average marks were 63 per paper. If he had obtained 18 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?