In a test matching Olympiad scoring rules, 4 marks are awarded for every correct answer and 1 mark is deducted for every wrong answer. Rohit answered all 60 questions in the test and scored a net total of 130 marks. How many questions did he answer correctly?

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• A 35
• B 38
• C 42
• D 45

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Answer: B. 38

Let the number of correct answers be C, so wrong answers = 60 - C.
4C - (60 - C) = 130, so 5C = 190 and C = 38.

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