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
E) 12
Solution   Let the number pf papers be x.   Then, 63x + 20+2=65x   65x-63x=22   2x = 22   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?