document.write( "Question 91114: A car radiator has a capacity of 16 quarts and is filled with a 25% Anti-freeze solution. How much must be drained off and replaced with pure Anti-freeze to obtain a 40% Anti-freeze solution? \n" ); document.write( "
Algebra.Com's Answer #66279 by ankor@dixie-net.com(22740)\"\" \"About 
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A car radiator has a capacity of 16 quarts and is filled with a 25% Anti-freeze solution. How much must be drained off and replaced with pure Anti-freeze to obtain a 40% Anti-freeze
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\n" ); document.write( "Let x = amt of 25% to be removed
\n" ); document.write( "and x = amt of pure antifreeze to be added
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\n" ); document.write( ".25(16-x) + 1.00x = .40(16)
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\n" ); document.write( "4 - .25x + 1x = 6.4
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\n" ); document.write( "-.25x + 1x = 6.4 - 4
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\n" ); document.write( ".75x = 2.4
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\n" ); document.write( "x = 2.4/.75
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\n" ); document.write( "x = 3.2 qts of 25% removed and 3.2 qts of pure antifreeze added
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\n" ); document.write( "Check solution, find amt of 25% remaining: 16 - 3.2 = 12.8
\n" ); document.write( ".25(12.8) + 3.2 = .4(16)
\n" ); document.write( " 3.2 + 3.2 = 6.4
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