SOLUTION: how many liters of 25 percent acid solution must be added to 80 liters of 40 percent solution to obtain a solution that is 30 percent acid?

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Question 783751: how many liters of 25 percent acid solution must be added to 80 liters of 40 percent solution to obtain a solution that is 30 percent acid?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many liters of 25 percent acid solution must be added to 80 liters of 40 percent solution to obtain a solution that is 30 percent acid?
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Equation::
acid + acid = acid
0.25x + 0.40*80 = 0.30(x+80)
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25x + 40*80 = 30x + 30*80
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-5x = -10*80
x = 160 liters (amt. of 25% solution to add)
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Cheers,
Stan H.