Question
There were a total of 30 questions in a Science quiz. 5 marks were awarded for each correct answer and 1 marks were deducted for each wrong answer. Winnie answered all the questions and scored 90 marks. How many more correct answers than wrong answers did she answer?
4 m

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There were a total of 30 questions in a Science quiz. 5 marks were awarded for each correct answer and 1 marks were deducted for each wrong answer. Winnie answered all the questions and scored 90 marks. How many more correct answers than wrong answers did she answer?