SOLUTION: We tried using a sample on the site, but we keep getting a negative answer! Help! How many kilograms of pure salt must be added to 20 kilograms of a 10% salt solution to obtain a

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Question 25657: We tried using a sample on the site, but we keep getting a negative answer! Help!
How many kilograms of pure salt must be added to 20 kilograms of a 10% salt solution to obtain a 25% salt solution?
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
20(10)=25(20-x)
200=500-25x
-25x=-300
x=12

Hence, about 12 kilograms of solution must be added.
Paul.