How to Calculate Solution Mixture for Iodine Concentration - 20% and 70%

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To create a 400-liter solution with 57.5% iodine using 20% and 70% iodine solutions, Sarah needs to apply the alligation method. This involves calculating the difference between the desired concentration and the concentrations of the available solutions. The calculations show that she should use approximately 285.71 liters of the 20% solution and 114.29 liters of the 70% solution. This mixture will yield the required iodine concentration. The alligation method simplifies the process of mixing solutions with different concentrations.
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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% = ?
 
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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.
 
Look up the term "alligation" on Google - you will find a simple and fast way of dealing with concentration problems.
 

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