SOLUTION: can you please help me understand and get the answer to this problem? here it is "you obtain 6 grams of a 7% saline solution by mixing some amount of 4% solution with some amount o

Question 822432: can you please help me understand and get the answer to this problem? here it is "you obtain 6 grams of a 7% saline solution by mixing some amount of 4% solution with some amount of 14%. how much of the 4% should you use?" it would be great if there was an explanation with the steps included in the response. if not, that's fine. thank you so much.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
x+y=6
we know that the two amounts add up to 6 grams
we just don't know how much of each yet.
.07*6=.04x+.14y
x=4.2, y=1.8

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