document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=526664>Question 526664</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How much pure acid should be mixed with 2 gallons of an 80% acid solution in order to get a 90% acid solution.\r<BR>\n" );
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document.write( "To get 90% acid solution , you need ( ) gallons of pure acid. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #348612 by </B><A HREF=/tutors/aboutme.mpl?userid=oberobic><B>oberobic(2304)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=oberobic><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=348612\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You have 2 gal. @ 80%, which is .8*2 = 1.6 gal. of pure acid.<BR>\n" );
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document.write( "You need add 'x' gallons of 100% pure acid to make a 90% solution.<BR>\n" );
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document.write( ".8*2 + 1*x = .9(2+x)<BR>\n" );
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document.write( "1.6 + x = 1.8 + .9x<BR>\n" );
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document.write( "multiply by 10 to eliminate decimals<BR>\n" );
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document.write( "16 + 10x = 18 + 9x<BR>\n" );
document.write( "x = 2<BR>\n" );
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document.write( "Answer:  Add 2 gallons of pure acid to 2 gallons of 80% acid to make a 90% acid solution.<BR>\n" );
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document.write( "Check the answer:<BR>\n" );
document.write( ".8*2 = 1.6 gal of pure acid in the original 2 gal.<BR>\n" );
document.write( "1.6 + 2 = 3.6 gal of pure acid in the final solution.<BR>\n" );
document.write( "3.6/4 * 100 = 90%.<BR>\n" );
document.write( "Correct.<BR>\n" );
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document.write( "Done. </SPAN>\n" );
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