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In an examination, a pupil’s average mark was 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?
Answer & Solution
Correct Answer:
Option
D
Let the number of paper be x
Then, pupil's total score = 63x
∴ $$\frac{63x + 20 + 2}{x}$$ = 65
⇒ 2x = 22
⇒ x = 11
Then, pupil's total score = 63x
∴ $$\frac{63x + 20 + 2}{x}$$ = 65
⇒ 2x = 22
⇒ x = 11
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