SOLUTION: How many milliliters of 20 percent acid should be added to pure acid to make 40 milliliters of 30 percent acid?

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Question 759092: How many milliliters of 20 percent acid should be added to pure acid to make 40 milliliters of 30 percent acid?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many milliliters of 20 percent acid should be added to pure acid to make 40 milliliters of 30 percent acid?
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Equation:
acid + acid = acid
0.20x + 1.00(40-x) = 0.30*40
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20x + 100*40 - 100x = 30*40
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-80x = -70*40
x = 35 ml (amt. of 20% solution needed)
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Cheers,
Stan H.
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