SOLUTION: How much 10% of 30% saline solutions should you mix to get 10 liters of 15% saline solution? Thank you! :)

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Question 980861: How much 10% of 30% saline solutions should you mix to get 10 liters of 15% saline solution?
Thank you! :)
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Understanding as, "how much of 10% and 30%....".

x, how much of the 10% saline solution
10-x, how much of the 30%.

highlight_green%28%2810x%2B30%2810-x%29%29%2F10=15%29

%28x%2B3%2810-x%29%29=15

x%2B30-3x=15

-2x=15-30

2x=15

highlight%28x=7%261%2F2%29................................