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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?

Correct answer: D. 11

  • A. 8
  • B. 9
  • C. 10
  • D. 11

Explanation

The two corrections add 20 marks + 2 marks = 22 marks to the total. Since the average rises from 63 marks to 65 marks, the increase is 2 marks per paper, so the number of papers is 22 marks ÷ 2 marks per paper = 11 papers. The likely mistake is option c, which treats the 22 extra marks as if they were spread over 10 papers.

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