SOLUTION: A 30% salt solution is prepared by mixing a 20% salt solution and a 45% salt solution. How many litres of each must be used to produce 60 L of the 30% salt solution?

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Question 101307: A 30% salt solution is prepared by mixing a 20% salt solution and a 45% salt solution. How many litres of each must be used to produce 60 L of the 30% salt solution?
Answer by stanbon(75887) About Me  (Show Source):
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A 30% salt solution is prepared by mixing a 20% salt solution and a 45% salt solution. How many litres of each must be used to produce 60 L of the 30% salt solution?
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Let amt of 20% solution be "x" L ; amt of active ingredient = 0.20x L
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Amt of 45% solution is "60-x" L ;amt active is 0.45(60-x)= 27-0.45x L
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Amt of 30% mixture is 60 L; amt active is 18 L
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EQUATION
0.20x + 27 - 0.45x = 18
-0.15x = -7
x = 46.67 L (amt of 20% solution)
60-x = 13.33 L (amt of 45% solution)
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Cheers,
Stan H.