SOLUTION: Marie mixes 16 liters of 18% acid solution with a 27% acid solution to make a 21% acid solution. How many liters of 27% solution did she use?

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Question 809869: Marie mixes 16 liters of 18% acid solution with a 27% acid solution to make a 21% acid solution.
How many liters of 27% solution did she use?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
16*.18+.27*x=.21*(x+16)
x=8