SOLUTION: How many litres of pure hydrochloric acid must be mixed with 3 liters of 20% hydrochloric acid to make 50% hydrochloric acid? Thanks for the help

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Question 29942: How many litres of pure hydrochloric acid must be mixed with 3 liters of 20% hydrochloric acid to make 50% hydrochloric acid? Thanks for the help
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
Let the solution be x
Equation:
3(20)=50(x-3)
60=50x-150

x=4.2

Hence, about 4.2L of hydrocholric acid is needed.
Paul.