Question
In a test, every participant had to answer 45 questions. 4 marks were given for every correct answer and 4 marks were taken away for every wrong answer. Albert answered all 45 questions and scored 156 marks. How many questions did he answer correctly?
4 m

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In a test, every participant had to answer 45 questions. 4 marks were given for every correct answer and 4 marks were taken away for every wrong answer. Albert answered all 45 questions and scored 156 marks. How many questions did he answer correctly?