SOLUTION: how many liters of pure hydrochloric acid must be added to 60 liters of a solution that is 10% hydrochloric acid to get a solution that is 15% hydrochloric acid?

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Question 278588: how many liters of pure hydrochloric acid must be added to 60 liters of a solution that is 10% hydrochloric acid to get a solution that is 15% hydrochloric acid?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
first mixture + second mixture = total mixture
Here is your equation and you can finish.
Let x = amount of liter of pure hydrochloric acid
60x + 0.10x = (x + 60)(0.15)
Can you solve for x now?