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Reasoning and Writing Question, what's your interpretation?

  1. Apr 4, 2012 #1
    1. The problem statement, all variables and given/known data
    A student takes a 30-question mathematics exam on which she got n questions correct and m questions incorrect and left k questions blank. If correct answers are worth 4 points, incorrect answers are worth -1 points, and blank answers are worth 0 points, write an equation to describe the student's total score as a ratio of total points earned to total points possible.


    2. Relevant equations
    anything you can come up with! it's a logic-based question and they accept many different answers.


    3. The attempt at a solution
    what I would think, is that since there are 30 question, and if you get them all right you'll get 4 points each, meaning you'll get a 120 if you get a perfect score.
    so the equation I came up with is:
    4n - 1m + 0k = 120
    4n - 1m = 120

    any other suggestions? does this answer all parts of the question? looking for clever responses...
     
  2. jcsd
  3. Apr 4, 2012 #2
    Setting it equal to 120 is not a ratio.
     
  4. Apr 4, 2012 #3
    yeah thats a typo, on my paper i have a colon

    4n - 1m : 120
     
  5. Apr 4, 2012 #4
    Do you have any reason to believe your answer is insufficient?
     
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