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Math Help - roll of ribbon

  1. #1
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    roll of ribbon

    A roll of ribbon measures 20 metres. How many 34 cm ribbons can be cut from the roll? How much ribbon will be left over?

    i got
    0.34 x 20 m = 6.80 can be cut 13.20 m left is that correct
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  2. #2
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    That is not correct. You need to make sure you are doing the right thing with the units . For example you are getting:

    0.34 meters x 20 meters = 6.80 meters^2

    What you need to do is to do a division.

    You have each ribbon is 0.34 meters/ ribbon. This makes it 1/0.34 ribbons/ meter = 2.941 ribbons/ meter

    Now you multiply the two expressions together to get

    20 meters x 2.941 ribbons/ meter = 58.82 ribbons

    However you cannot have 0.82 of a ribbon, so you cut only 58 ribbons. They use up 58 ribbons x 0.34 meters/ ribbon = 19.72 meters

    You have 20 - 19.72 = 0.28 meters remaining
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  3. #3
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    thanx
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