document.write( "Question 437599: how many gallons of a 90% antifreeze solution must be mixed with 90 gallons of 15% antifreeze to get a mixture that is 80% antifreeze? \n" ); document.write( "

Algebra.Com's Answer #302724 by mananth(16946) $\"\"$ $\"About$

You can put this solution on YOUR website!
------ Percent ---------------- quantity
\n" ); document.write( "Antifreeze 15 ----------------90
\n" ); document.write( "Antifreeze 90 ----------------x
\n" ); document.write( "Total 80 ---------------- 90 + x
\n" ); document.write( "
\n" ); document.write( "15*90+90*x=80(90+x)
\n" ); document.write( "1350+90x=7200+80x
\n" ); document.write( "90x-80x =7200-1350
\n" ); document.write( "10x=5850
\n" ); document.write( "/10
\n" ); document.write( "x=585 gallons 90 % Antifreeze
\n" ); document.write( " \n" ); document.write( "

\n" );