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In an objective examination of 90 questions, 5 marks are allotted for every correct answer and 2 marks are deducted for every wrong answer. After attempting all the 90 questions Sumit got a total of 387 marks. Find the number of questions that he attempted wrong.

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In an objective examination of 90 questions, 5 marks are allotted for every correct answer and 2 marks are deducted for every wrong answer. After attempting all the 90 questions Sumit got a total of 387 marks. Find the number of questions that he attempted wrong.






 
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