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In a certain examination, the average marks of an examinee is 64 per paper. if he had obtained 18 more marks for his Mathematics paper and 4 more marks for his English paper, his average per paper would have been 66. How many papers were there in the examination ?
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- 11
- 13
- 9
- 15
- None of the above
Correct Option: A
Let the number of papers = x.
According to the question,
64x + 18 + 4 = 66x
∴ 2x = 22
∴ x = 22/2 = 11
