SOLUTION: how many ounces of a 20% saline solution must be added to 50 ounces of a 4% saline solution to make a 10% saline solution?

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Question 428482: how many ounces of a 20% saline solution must be added to 50 ounces of a 4% saline solution to make a 10% saline solution?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
.2m+50(.04)=.1(m+50)
.2m+2=.1m+5
.1m=3
m=3/.1=30
You need 30 ozs. of 20% saline for your solution..