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OpenStudy (anonymous):
How do I solve... A pharmacist has 20 L of a 10% drug solution. How many liters of 5% solution must be added to get a mixture the is 8%?
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OpenStudy (anonymous):
call the liters added x now we have: ( 20 * 0.1 + x * 0.05 ) / (20+x) = 0.08 solve for x.
hero (hero):
20 + x = y .10(20) + .05(x) = .08(y)
hero (hero):
x = amount added y = combined amount
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