SOLUTION: Patti has two solutions. One is 27% acid the other is 39% acid. How much of each solution should be mixed together to make 9 liters of a solution that is 29% acid?

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Question 821427: Patti has two solutions. One is 27% acid the other is 39% acid. How much of each solution should be mixed together to make 9 liters of a solution that is 29% acid?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a+b=9,
.27a+.39b=.29*9
a=7.5, b=1.5