<PRE><B>Question 490981</B>
A dehydrated patient needs a 6.4% saline IV. Unfortunately, the hospital only has bags of 6% and 8% saline solutions. How many liters of each of these solutions should be mixed together to yield 1 liter of the desired concentration? 
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Equation:
salt + salt = salt
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0.06x + 0.08(1-x) = 0.064*1
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Multiply thru by 1000 to get:
60x + 80 - 80x = 64
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-20x = -16
x = 0.8 liters (amt. of 6% solution needed)
1-x = 0.2 liters (amt. of 8% solution needed)
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Cheers,
Stan H.</PRE>