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Then the total number of incorrect sums =24 - x.
Given that he gets 3 marks for each correct answer and loses 2 marks for each incorrect sum. and he obtained 37 marks.
3x - (24 - x) * 2 = 37
3x - 48 + 2x = 37
5x - 48 = 37
5x = 37 + 48
5x = 85
x = 85/5
x = 17.
Therefore the number of correct sums = 17.
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