SOLUTION: 1st question: A chemist needs a saline solution that is 20% sodium chloride but only has solutions that are 15% and 40% solution should she add to make a 20% solution?

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Question 261151: 1st question: A chemist needs a saline solution that is 20% sodium chloride but only has solutions that are 15% and 40% solution should she add to make a 20% solution?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
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.15x+.40y=.20(x+y)
Did you leave out some info? such as how much we have at the end or how much we start with?
x=4y
add 4 parts 15% solution to one part 40%