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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.

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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