Question
In a test, every participant had to answer 30 questions. 3 marks were given for every correct answer and 2 marks were taken away for every wrong answer. Albert answered all 30 questions and scored 25 marks. How many questions did he answer correctly?
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In a test, every participant had to answer 30 questions. 3 marks were given for every correct answer and 2 marks were taken away for every wrong answer. Albert answered all 30 questions and scored 25 marks. How many questions did he answer correctly?