document.write( "Question 902516: Write an equation in terms of x that determines how much water should be added to x liters of an 18% solution to reduce the concentration to 15%? \n" ); document.write( "
Algebra.Com's Answer #547296 by josgarithmetic(39618)\"\" \"About 
You can put this solution on YOUR website!
Percent will be treated as weight per weight.\r
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\n" ); document.write( "\n" ); document.write( "Let D = density of the salt solution, grams/mL, 18% solution.
\n" ); document.write( "Let y = MASS in grams of water to add to get 15% salt.
\n" ); document.write( "The reason for the factor 1000 is because I am solving with GRAMS and MILILITERS.\r
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\n" ); document.write( "\n" ); document.write( "\"highlight%28%280.18%2A%28x%2A1000%2AD%29%29%2F%28x%2A1000%2AD%2By%29=0.15%29\"\r
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\n" ); document.write( "\n" ); document.write( "Algebra Steps---
\n" ); document.write( "\"0.18D%2A1000x=0.15%28D%2A1000x%2By%29\"
\n" ); document.write( "\"0.15%2A1000%2AD%2Ax%2B0.15y=0.18%2A1000%2AD%2Ax\"
\n" ); document.write( "\"0.15y=0.18%2A1000Dx-0.15%2A1000Dx\"
\n" ); document.write( "\"y=%280.18%2A1000Dx-0.15%2A1000Dx%29%2F0.15\"
\n" ); document.write( "\"y=%280.03%2F0.15%29%281000Dx%29\"
\n" ); document.write( "\"y=%280.2%291000Dx\"
\n" ); document.write( "\"highlight%28highlight%28y=200Dx%29%29\", GRAMS of water.
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