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Math

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A certain car is about 100in. long and 60 in. wide. You plan to make a model of this car that is 9 in. wide. How long will your model be?

  • Math - ,

    60 inches : 9 inches
    = 20:3 , is your ratio or your scale
    so just set up a simple proportion

    x/100 = 9/60
    x = 100(9/60) = 15

    it should be 15 inches long

    notice: 100/15 = 20/3
    and 60/9 = 20/3

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