<PRE><B>Question 1110474</B>
 how many liters of a 20% alcohol solution should be added to a 450 L solution which contain 35% alcohol so that the resulting mixture will be 30% alcohol.
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Equation::
alch + alch = alch
0.2x + 0.35*450 = 0.3(x+450)
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20x + 35*450 = 30x + 30*450
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10x = 5*450
x = 225 L (amt. of 20% solution needed)
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Cheers,
Stan H.
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