SOLUTION: you are given all the 6% salt solution and pure water you want and you are asked to make up exactly 400 milliliters of a 1.5% salt solution. explain how you would do this.

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Question 797144: you are given all the 6% salt solution and pure water you want and you are asked to make up exactly 400 milliliters of a 1.5% salt solution. explain how you would do this.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
{amount of salt}/{amount of solution}={concentration of salt}

Your goal is to dilute the 6% salt solution. You add water and no change happens to the AMOUNT of salt.

The question may expect that concentration is understood as weight per volume.

Let u = amount of water, milliliters
Let v = amount of 6% salt solution, milliliters

%280%2Au%2B6%2Av%29%2F%28400%29=1.5 AND u%2Bv=400