SOLUTION: How much 30% acid solution should be added to 10% acid solution to make 100 ml of a 12% acid solution?

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Question 796590: How much 30% acid solution should be added to 10% acid solution to make 100 ml of a 12% acid solution?
Answer by stanbon(75887) About Me  (Show Source):
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How much 30% acid solution should be added to 10% acid solution to make 100 ml of a 12% acid solution?
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Equation:
acid + acid = acid
0.30x + 0.10(100-x) = 0.12*100
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30x + 10*100 - 10x = 12*100
20x = 2*100
x = 10 ml (amt of 30% solution needed)
100-x = 90 ml (amt of 10% solution needed)
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Cheers,
Stan H.