document.write( "Question 499482: how many gallons of 50% antifreeze solution must be mixed with 80 gallons of 15% anifreeze to get a mixture that is 40% anitfreeze? \n" ); document.write( "
Algebra.Com's Answer #337723 by nerdybill(7384)\"\" \"About 
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how many gallons of 50% antifreeze solution must be mixed with 80 gallons of 15% anifreeze to get a mixture that is 40% anitfreeze?
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\n" ); document.write( "Let x = amount (gallons) of 50% antifreeze
\n" ); document.write( "then
\n" ); document.write( ".50x + .15(80) = .40(x + 80)
\n" ); document.write( ".50x + 12 = .40x + 32
\n" ); document.write( ".10x + 12 = 32
\n" ); document.write( ".10x = 20
\n" ); document.write( "x = 200 gallons
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