SOLUTION: how many liters of a 20 percent solution must be mixed with 60 liters of a 90 percent solution to get a 70 percent solution

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Question 375273: how many liters of a 20 percent solution must be mixed with 60 liters of a 90 percent solution to get a 70 percent solution
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 20% solution added.
20A%2B90%2860%29=70%28A%2B60%29
2A%2B540=7A%2B420
-5A=-120
highlight%28A=24%29 liters