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There are 18 true-or-false questions in a Mathematics test. 2 marks will be given for each correct answer and 1 mark will be deducted for each wrong answer. If Mimi answers all the questions and gets 24 marks, how many correct answers has she got?

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  • tutor_fran
    2018-10-14 13:12:48
    let the number of correct answers is n, the number of wrong answer should be 18-n;
    we have (2)(n)+(-1)(18-n)=24, n=14;
    therefore, she got 14 correct answers and 4 wrong answers.
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