document.write( "Question 293030: A 12-quart cooling system is tested and found filled with a 60% antifreeze solution. The ideal solution should be a 50% antilfreeze solution. How many quarts of solution needs to be drained and replaced with pure water to reach the ideal mixture? \n" ); document.write( "

Algebra.Com's Answer #211537 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A 12-quart cooling system is tested and found filled with a 60% antifreeze solution.
\n" ); document.write( " The ideal solution should be a 50% antifreeze solution.
\n" ); document.write( " How many quarts of solution needs to be drained and replaced with pure water to reach the ideal mixture?
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\n" ); document.write( "Let x = amt of solution to be removed and also amt of water to be added
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\n" ); document.write( ".60(12-x) = .50(12)
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\n" ); document.write( "7.2 - .6x = 6
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\n" ); document.write( "-.6x = 6 - 7.2
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\n" ); document.write( "-.6x = -1.2
\n" ); document.write( "x = $\"1.2%2F.6\"$
\n" ); document.write( "x = 2 qt of 60% solution removed and 2 qt of water added
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