document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=877598>Question 877598</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many quarts of pure antifreeze must be added to 4 quarts of a 40% antifreeze solution to obtain a 60% antifreeze solution? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #529426 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=529426\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \"4 quarts of a 40% antifreeze solution\" ---> 4*0.40 = 1.6 quarts of pure antifreeze.\r<BR>\n" );
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document.write( "Adding some unknown amount, call it x, of pure antifreeze gives you 1.6+x quarts of pure antifreeze.\r<BR>\n" );
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document.write( "You have 4 quarts of a mixed solution and you're adding x quarts of pure antifreeze to the mix. <BR>\n" );
document.write( "So you end up with a total of 4+x quarts of mixed solution.\r<BR>\n" );
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document.write( "(amount of pure antifreeze)/(amount of solution) = percent of antifreeze\r<BR>\n" );
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document.write( "(1.6 + x)/(4 + x) = 0.60\r<BR>\n" );
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document.write( "1.6 + x = 0.60(4 + x)\r<BR>\n" );
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document.write( "1.6 + x = 0.60(4) + 0.60(x)\r<BR>\n" );
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document.write( "1.6 + x = 2.4 + 0.60x\r<BR>\n" );
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document.write( "1.6 + x - 0.60x = 2.4\r<BR>\n" );
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document.write( "x - 0.60x = 2.4 - 1.6\r<BR>\n" );
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document.write( "0.40x = 0.8\r<BR>\n" );
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document.write( "x = 0.8/0.40\r<BR>\n" );
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document.write( "x = 2\r<BR>\n" );
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document.write( "You need to add <font color=\"red\">2 quarts</font> of pure antifreeze. </SPAN>\n" );
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