document.write( "Question 327252: how many quarts of pure antifreeze must be added added to 9 quarts of a 40% antifreeze solution to obtain a 50% antifreeze solution \n" ); document.write( "
Algebra.Com's Answer #234401 by galactus(183)\"\" \"About 
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Let x=amount of pure antifreeze.\r
\n" ); document.write( "\n" ); document.write( "When we add this to the 9 quarts of the 40%, we have 9+x quarts.\r
\n" ); document.write( "\n" ); document.write( "So, we have:\r
\n" ); document.write( "\n" ); document.write( "x+.4(9)=.5(9+x)\r
\n" ); document.write( "\n" ); document.write( "Solving for x gives x=1.8 quarts of pure antifreeze.
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