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math

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in an examination there are 180 questions , 4 marks is given for each correct answers and 1 marks is subtracted for each wrong answers . if a boy scores 220 marks find the no of correct and wrong answers ???

  • math - ,

    If there are c correct and w wrong answers,

    c+w=180
    4c-w = 220

    c=80
    w=100

    check: 4*80-100=220

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