document.write( "Question 197373: A car radiator is filled with 5 liters of 25% antifreeze solution. How many liters must be drawn off and replaced by a 75% antifreeze solution to leave the radiator filled with a 55% anitfreeze solution? \n" ); document.write( "
Algebra.Com's Answer #148013 by ankor@dixie-net.com(22740)\"\" \"About 
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A car radiator is filled with 5 liters of 25% antifreeze solution.
\n" ); document.write( " How many liters must be drawn off and replaced by a 75% antifreeze
\n" ); document.write( " solution to leave the radiator filled with a 55% antifreeze solution?
\n" ); document.write( ":
\n" ); document.write( "Let x = amt of original solution to be removed
\n" ); document.write( "and also
\n" ); document.write( "let x = amt of 75% solution to be added
\n" ); document.write( ";
\n" ); document.write( ".25(5 - x) + .75x = .55(5)
\n" ); document.write( ":
\n" ); document.write( "1.25 - .25x + .75x = 2.75
\n" ); document.write( ":
\n" ); document.write( "-.25x +.75x = 2.75 - 1.25
\n" ); document.write( ":
\n" ); document.write( ".5x = 1.5
\n" ); document.write( ":
\n" ); document.write( "x = \"1.5%2F.5\"
\n" ); document.write( "x = 3 liters to be removed and 3 liters of 75% solution to be added
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check solution in original equation:
\n" ); document.write( ".25(5 - 3) + .75(3) = .55(5)
\n" ); document.write( ".50 + 2.25 = 2.74 \n" ); document.write( "
\n" );