SOLUTION: We have 80 liters of a 2% saline solution. How much of a 10% saline solution should we add to this to increase the salinity to 4%?

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Question 893920: We have 80 liters of a 2% saline solution. How much of a 10% saline solution should we add to this to increase the salinity to 4%?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
We have 80 liters of a 2% saline solution. How much of a 10% saline solution should we add to this to increase the salinity to 4%?
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Add x liters.
80*2 + x*10 = (80+x)*4