document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1085556>Question 1085556</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many gallons of 80% antifreeze solution must be mixed with 100 gallons of 15% antifreeze to get a mixture that is 70% antifreeze?\r<BR>\n" );
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document.write( "I need ??? Gallons for answer </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #699637 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=699637\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let x = the number of gallons of 80% antifreeze.\r<BR>\n" );
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document.write( "your formula becomes:\r<BR>\n" );
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document.write( ".8 * x + .15 * 100 = .7 * (x + 100)\r<BR>\n" );
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document.write( "simplify this formula to get .8 * x + 15 = .7 * x + 70\r<BR>\n" );
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document.write( "subtract .7 * x from both sides of the equation and subtract 15 from both sides of the equation to get .8 * x - .7 * x = 70 - 15\r<BR>\n" );
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document.write( "simplify to get .1 * x = 55.\r<BR>\n" );
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document.write( "solve for x to get x = 55/.1 = 550 gallons.\r<BR>\n" );
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document.write( "you would need 550 gallons of 80% antifreeze to mix with 100 gallons of 15% antifreeze to get 650 gallons of 70% antifreeze.\r<BR>\n" );
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document.write( ".8 * 550 = 440 gallons of pure antifreeze<BR>\n" );
document.write( ".15 * 100 = 15 gallons of pure antifreeze<BR>\n" );
document.write( "total = 455 gallons of pure antifreeze\r<BR>\n" );
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document.write( ".7 * 650 = 455 gallons of pure antifreeze\r<BR>\n" );
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document.write( "solution looks good.\r<BR>\n" );
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document.write( "you would need 550 gallons of 80% antifreeze solution.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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