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8th grade math

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A quiz had only 3-point questions and four-point questions. The best possible score is 100, and there are 29 questions. How many 4-point questions are there?

  • 8th grade math - ,

    number of 4 point questions --- x
    number of 3 point questions --- 29-x

    solve for x

    4x + 3(29-x) = 100

  • 8th grade math - ,

    4x+3(29-x)=100
    4x+87-3x=100
    87+x=100
    x=13
    13 questions
    :)

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