document.write( "Question 422580: A mechanic needs a radiator to have a 40% antifreeze solution. The radiator currently is filled with 4 gallons of a 25% antrifreeze solution. How much of the antifreeze mixture should be drained from the car if the mechanic replaces it with pure antifreeze?
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Algebra.Com's Answer #295097 by lwsshak3(11628)\"\" \"About 
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A mechanic needs a radiator to have a 40% antifreeze solution. The radiator currently is filled with 4 gallons of a 25% antrifreeze solution. How much of the antifreeze mixture should be drained from the car if the mechanic replaces it with pure antifreeze?\r
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\n" ); document.write( "\n" ); document.write( "let x=gallons of current mixture to be drained and replaced with pure antifreeze.
\n" ); document.write( "4-x=gallons of current mixture remaining in the car.
\n" ); document.write( ".25(4-x)+1.00x=.40*4
\n" ); document.write( "1-.25x+x=1.6
\n" ); document.write( ".75x=.6
\n" ); document.write( "x=.6/.75=0.8 gal
\n" ); document.write( "ans:
\n" ); document.write( "0.8 gallons of current mixture to be drained and replaced with pure antifreeze.
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