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 344077: 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 Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 5% solution.
10%2820%29%2B5%28A%29=8%2820%2BA%29
200%2B5A=160%2B8A
3A=40
highlight%28A=40%2F3%29liters.