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In an objective examination of 120 questions, 4 marks are allotted for every correct answer and 1 mark is deducted for every wrong answer. After attempting all 120 questions a student got a total of 290 marks. Find the number of questions he attempted wrong.

Correct Answer: 38
Let the number of questions attempted wrong be x. Then the number of questions attempted correct is (120-x). By data, 4*(120-x) – 1*x = 290 ? x = 38. Therefore, the number of questions he attempted wrong is 38.

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