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

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Question 121986: Twenty pounds of a salt-water solution contains fifteen percent salt. How much water must be added to weaken the solution to twelve percent salt?
Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!
Salt= 20(0,15)=3 pounds, you must add x pounds of water where:
3/(20+x)=0,12 then 20+x=3/(0,12)=25 then x=5
You must add 5 pounds of water