<PRE><B>Question 718467</B>
how many ounces of a 2% acid solution should be mixed with a 4% acid solution to produce 20 ounces of a 3.6% acid solution?
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Equation:
acid + acid = acid
0.02x + 0.04(20-x) = 0.036*20
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20x + 49*20 - 40x = 36*20
-20x = -13*20
x = 13 ounces (amt. of 2% solution needed)
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Cheers,
Stan H.
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