document.write( "Question 25657: We tried using a sample on the site, but we keep getting a negative answer! Help!
\n" ); document.write( "How many kilograms of pure salt must be added to 20 kilograms of a 10% salt solution to obtain a 25% salt solution?
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Algebra.Com's Answer #13762 by Paul(988)\"\" \"About 
You can put this solution on YOUR website!
20(10)=25(20-x)
\n" ); document.write( "200=500-25x
\n" ); document.write( "-25x=-300
\n" ); document.write( "x=12\r
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\n" ); document.write( "\n" ); document.write( "Hence, about 12 kilograms of solution must be added.
\n" ); document.write( "Paul.
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