SOLUTION: How many liters of a 20% salt solution must be added to 30 liters of a 15% solution to get a solution that is 18% salt?

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Question 849756: How many liters of a 20% salt solution must be added to 30 liters of a 15% solution to get a solution that is 18% salt?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev
Mixture: one material quantity unknown

Study that and you will know what to do on all of them of this type.