SOLUTION: How many liters of water should be added to 40 liters of an 18% saline solution, to produce a 10% saline solution?

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Question 847748: How many liters of water should be added to 40 liters of an 18% saline solution, to produce a 10% saline solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
That is assuming percent w/v.
w = volume of water to add, in liters.

40%2A18%2F%28w%2B40%29=10, solve this for w.

More complete help here:
http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev