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OpenStudy (anonymous):
How many liters of a 40% acid solution must be added to 12 liters of a 20% solution r=to obtain a 25% solution?
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OpenStudy (dumbcow):
set up a equation equating the amount of acid --> (.4)x + (.2)*12 = (.25)(x+12) solve for x
OpenStudy (dumbcow):
you can get rid of decimals by multiplying entire equation by 100 40x +20*12 = 25(x+12)
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