Algebra

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pam scored 78 on a test that had 4 fill-in questions worth 7 points each and 24 muliple choice questions worth 3 points each. She had one fill-in question wrong. How many multiple-choice questions did pam get right?

  • Algebra -

    let x = number of multiple questions she got right.
    then we set up the equation and solve for x:
    (4-1)*7 + 3x = 78
    21 + 3x = 78
    3x = 57
    x = 19

    hope this helps~ :)

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