<PRE><B>Question 902315</B>
How many liters of a 85% acid solution must be added to 12 liters of a 25% acid solution to produce a 49% acid solution?
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Equation:
acid + acid = acid
0.85x + 0.25*12 = 0.49(x + 12
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85x + 25*12 = 49x + 49*12
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36x = 24*12
x = (2/3)12
x = 8 liters (amt. of 85% solution needed)
12-x = 4 liters (amt. of 25% solution needed)
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Cheers,
Stan H.</PRE>