Question
In a test, every participant had to answer 40 questions. 3 marks were given for every correct answer and 3 marks were taken away for every wrong answer. Fabian answered all 40 questions and scored 30 marks. How many questions did he answer correctly?
4 m

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In a test, every participant had to answer 40 questions. 3 marks were given for every correct answer and 3 marks were taken away for every wrong answer. Fabian answered all 40 questions and scored 30 marks. How many questions did he answer correctly?