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?
A. 8
B. 9
C. 10
D. 11

• Let the number of papers be x. Then,63x+20+2=65x
  2x=22
  x=11
• 8 years agoHelpfull: Yes(2) No(0)
• x(total marks)/y( no . of subjects)= 63;
  x+20+2/y= 65;x+22/y=65
  on solving :
  y=11 (D)
• 11 years agoHelpfull: Yes(0) No(1)
• using hit and trial method
  693/11=65
• 9 years agoHelpfull: Yes(0) No(2)