SOLUTION: How many liters of a 4% solution of salt should be added to a 24% solution in order to obtain 680 liters of a 9% solution?

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Question 941477: How many liters of a 4% solution of salt should be added to a 24% solution in order to obtain 680 liters of a 9% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Best advice is follow this plan:

Mixing two concentrations for known amount of mixture
http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev