SOLUTION: How many ounces of a 25 percent saline solution must be added to 50 ounces of a 13 percent saline solution to make a 20 percent saline solution?

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Question 460541: How many ounces of a 25 percent saline solution must be added to 50 ounces of a 13 percent saline solution to make a 20 percent saline solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.25n+50(.13)=.2(n+50)
.25n+6.5=.2n+10
.05n=3.5
n=3.5/.05=70
You need 70 ozs. of 13% solution to make your mix..