SOLUTION: What quantity of a 40% acid solution must be mixed with a 10% solution to produce 300 quarts of a 30% solution?

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Question 399404: What quantity of a 40% acid solution must be mixed with a 10% solution to produce 300 quarts of a 30% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
What quantity of a 40% acid solution must be mixed with a 10% solution to produce 300 quarts of a 30% solution?
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Equation:
acid + acid = acid
0.40x + 0.10(300-x) = 0.30*300
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Multiply thru by 100 to get:
40x + 10*300 - 10x = 30*300
30x = 20*300
x = 200 quarts (amt. of 40% solution needed for the mixture)
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Cheers,
Stan H.