document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1203496>Question 1203496</A>: <I><SPAN STYLE=\"word-break: break-all;\"> It is desired to draw off a part of 10 gallons of 30% solution of alcohol and to replace it by pure alcohol so as to produce a 50% solution. How many gallons should be drawn off? </SPAN>\n" );
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document.write( "This method may be approximate, not perfectly accurate:\r<BR>\n" );
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document.write( "Draw off some v gallons of the 30% alcohol.<BR>\n" );
document.write( "Replace with v gallons of the 100% alcohol.<BR>\n" );
document.write( "Want 50% alcohol result.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2810%2A0.30-0.3v%2Bv%29%2F10=0.50 ALIGN=MIDDLE  ALT=\"%2810%2A0.30-0.3v%2Bv%29%2F10=0.50\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "-\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0.3%2A10%2B%281-0.3%29v=10%2A0.5 ALIGN=MIDDLE  ALT=\"0.3%2A10%2B%281-0.3%29v=10%2A0.5\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281-0.3%29v=10%2A0.5-0.3%2A10 ALIGN=MIDDLE  ALT=\"%281-0.3%29v=10%2A0.5-0.3%2A10\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=v=%280.5%2A10-0.3%2A10%29%2F%281-0.3%29 ALIGN=MIDDLE  ALT=\"v=%280.5%2A10-0.3%2A10%29%2F%281-0.3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >-----------all computations have been postponed to here.<BR>\n" );
document.write( "Now just compute v. </SPAN>\n" );
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