SOLUTION: A pharmacist needs 20% boric acid solution. How much 60% boric acid solution must be added to 7.5 liters of an 8% boric acid solution to get the desired strength?

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Question 345565: A pharmacist needs 20% boric acid solution. How much 60% boric acid solution must be added to 7.5 liters of an 8% boric acid solution to get the desired strength?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 60% solution.
60A%2B8%287.5%29=20%28A%2B7.5%29
60A%2B60=20A%2B150
40A=90
highlight%28A=9%2F4%29liters