document.write( "Question 1085259: The radiator truck contains 12 gallons of water. We draw off 3 gallons and replace it with alcohol, then draw off 3 gallons of the mixture and replace it by alcohol, etc., how much alcohol is in the dinal mixture? \n" ); document.write( "
Algebra.Com's Answer #699352 by ankor@dixie-net.com(22740)\"\" \"About 
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The radiator truck contains 12 gallons of water.
\n" ); document.write( " We draw off 3 gallons and replace it with alcohol,
\n" ); document.write( "Find the percent alcohol in decimal form, when this is done
\n" ); document.write( "\"3%2F12\" = .25
\n" ); document.write( " then draw off 3 gallons of the mixture and replace it by alcohol, etc., how much alcohol is in the final mixture?
\n" ); document.write( "let x = the percent of alcohol in the final mixture
\n" ); document.write( ".25(12-3) + 3 = 12x
\n" ); document.write( ".25(9) + 3 = 12x
\n" ); document.write( "2.25 + 3 = 12x
\n" ); document.write( "5.25 = 12x
\n" ); document.write( "x = 5.25/12
\n" ); document.write( "x = .4375 * 100 = 43.75% alcohol in the final mixture
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