SOLUTION: 4% of 510 lbs of the sea water is salt. How much pure water is to be extracted to make a contain 15% salt?

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Question 658506: 4% of 510 lbs of the sea water is salt. How much pure water is to be extracted to make a contain 15% salt?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
4% of 510 lbs of the sea water is salt. How much pure water is to be extracted to make a contain 15% salt?
.
Let x = amount (lbs) of pure water removed
then
.04(510) = .15(510-x)
20.4 = 76.5-.15x
-56.1 = -.15x
374 lbs = x