SOLUTION: a 25% brine solution was mixed with an 18% brine solution to produce a 20% brine solution. How much of the 25% brine solution and how much of the 18% brine solution were used to pr

Question 743451: a 25% brine solution was mixed with an 18% brine solution to produce a 20% brine solution. How much of the 25% brine solution and how much of the 18% brine solution were used to produce 28L of the 20% solution?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a 25% brine solution was mixed with an 18% brine solution to produce a 20% brine solution. How much of the 25% brine solution and how much of the 18% brine solution were used to produce 28L of the 20% solution?
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Equation:
salt + salt = salt
0.18x + 0.25(28-x) = 0.20*28
18x + 25*28 - 25x = 20*28
-7x = -5*28
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x = 20 L (amt. of 18% solution needed)
28-x = 8 L (amt of 25% solution needed)
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Cheers,
Stan H.
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