SOLUTION: Suppose a chemist combines a 25% acid solution and a 50% acid solution to make 40 l of 45% acid solution. How many liters of each solution did she use?

Question 820426: Suppose a chemist combines a 25% acid solution and a 50% acid solution to make 40 l of 45% acid solution. How many liters of each solution did she use?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Suppose a chemist combines a 25% acid solution and a 50% acid solution to make 40 l of 45% acid solution. How many liters of each solution did she use?
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acid + acid = acid
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0.25x + 0.50(40-x) = 0.45*40
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25x + 50*40 - 50x = 45*40
-25x = -5*40
x = (1/5)40
x = 8 liters (amt of 25% solution needed)
40-x = 32 liters (amt. of 50% solution needed)
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Cheers,
Stan H.
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