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Homework Help: Concentration problems

  1. Jun 19, 2006 #1
    Sarah wants to mix 400 liters of a solution that is 57.5 iodine. She has two solutions available. One is 20% iodine and the other is 70% iodine. How many liters of both should Sarah use?

    Answer in the form: 20% = ?, 70% = ?
  2. jcsd
  3. Jun 19, 2006 #2


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    Richay, you've just read the other thread where you've been asked to show your work first. Please read the posting guidelines. We can't help you unless you first show your work.
  4. Jun 21, 2006 #3


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    Look up the term "alligation" on Google - you will find a simple and fast way of dealing with concentration problems.
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