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?
Options:
A . 8
B . 9
C . 10
D . 11
Answer: Option D
Let the number pf papers be x. Then,63x+20+2=65x 65x-63x=22 2x=22 x=11.
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