SOLUTION: a pharmacist has 20 L of a 10% drug solution. How many liters of 5% solution must be added to get a mixture that is 8% ?

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Question 316114: a pharmacist has 20 L of a 10% drug solution. How many liters of 5% solution must be added to get a mixture that is 8% ?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
a pharmacist has 20 L of a 10% drug solution. How many liters of 5% solution must be added to get a mixture that is 8% ?
.
Let x= liters of 5% solution added
then
.05x + .10(20) = .08(20+x)
.05x + 2 = 1.6+.08x
2 = 1.6+.08x
.4 = .08x
5 liters = x