SOLUTION: How many liters of a 40% acid solution must be added to 100 liters of a 25% solution to obtain a 30% solution?

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Question 557812: How many liters of a 40% acid solution must be added to 100 liters of a 25% solution to obtain a 30% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many liters of a 40% acid solution must be added to 100 liters of a 25% solution to obtain a 30% solution?
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acid + acid = acid
0.40x + 0.25*100 = 0.30(x+100)
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40x + 25*100 = 30x + 30*100
10x = 500
x = 50 liters (amt. of 40% solution needed)
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Cheers,
Stan H.
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