SOLUTION: twenty pounds of salt-water solution contains fifteen percent salt. How much water must be added to weaken the solution to twelve percent salt?

Question 316001: twenty pounds of salt-water solution contains fifteen percent salt. How much water must be added to weaken the solution to twelve percent salt?
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
twenty pounds of salt-water solution contains fifteen percent salt. How much water must be added to weaken the solution to twelve percent salt?
.
Let x = pounds of water to add
then
.15(20) = .12(20+x)
3 = 2.4 + .12x
.6 = .12x
.6/.12 = x
5 pounds = x
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