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Amit appears for exam and score of 75 marks per paper.If he had obtained 15 more marks in maths paper and 10 marks in science then his average marks would have been 80 out of 100.For how many paper Amit appears?
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15 + 10 = 25 amounts to 5 mark increase in average. So, number of papers must be 25/5 = 5.
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