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 answers
A) 8  B) 9  C) 10  D) 11  E) 12
x(total marks)/y( no . of subjects)= 63;   x+20+2/y= 65;x+22/y=65   on solving :   y=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?