Water must be mixed with a 15% hydrochloric acid solution to dilute the concentration to 5%. How many liters of water should be added if we need 19 liters of the 5% solution? Round to the nearest tenth of a liter. I need an equation explained to me step by step, all the way to the end, that get's 12.7 liters as the answer. 12.7 liters is the answer given to me by my online math program.

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id try it again, but i dont really know how to explain it simpler

Where did you get the 2.85 in your equation, in the second part...19(.05)2.85-.15w?

you can find the liters of HCl solution:
.15H=19*.05
H=6.3
then 19-6.3=12.7
12.7 liters of water.

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