document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=193489>Question 193489</A>: <I><SPAN STYLE=\"word-break: break-all;\"> one invention saves 30% on fuel; a second saves 45%;a third, 25%. if you use all three inventions at once how much can you save? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #145245 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=145245\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Say you used the inventions on a tank that holds<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=100 ALIGN=MIDDLE  ALT=\"100\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons of fuel. With the 1st invention,<BR>\n" );
document.write( "you'd only use 70 gallons to go a far as you went <BR>\n" );
document.write( "on a tankful before. Call that distance <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi<BR>\n" );
document.write( "With the 2nd invention, you'd use 55 gallons<BR>\n" );
document.write( "With the 3rd invention, you'd use 75 gallons<BR>\n" );
document.write( "The fuel efficiencies are:<BR>\n" );
document.write( "No inventions: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F100 ALIGN=MIDDLE  ALT=\"d%2F100\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/gal <BR>\n" );
document.write( "1st invention: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F70 ALIGN=MIDDLE  ALT=\"d%2F70\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/gal<BR>\n" );
document.write( "2nd invention: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F55 ALIGN=MIDDLE  ALT=\"d%2F55\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/gal<BR>\n" );
document.write( "3rd invention: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F75 ALIGN=MIDDLE  ALT=\"d%2F75\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/gal<BR>\n" );
document.write( "---------------------------------<BR>\n" );
document.write( "These are RATES of fuel usage. I can add<BR>\n" );
document.write( "the rates to get a combined rate<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F70+%2B+d%2F55+%2B+d%2F75 ALIGN=MIDDLE  ALT=\"d%2F70+%2B+d%2F55+%2B+d%2F75\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A%281%2F70+%2B+1%2F55+%2B+1%2F75%29 ALIGN=MIDDLE  ALT=\"d%2A%281%2F70+%2B+1%2F55+%2B+1%2F75%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A%28165%2F11550+%2B+210%2F11550+%2B+154%2F11550%29 ALIGN=MIDDLE  ALT=\"d%2A%28165%2F11550+%2B+210%2F11550+%2B+154%2F11550%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A%28529%2F11550%29 ALIGN=MIDDLE  ALT=\"d%2A%28529%2F11550%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A.0458 ALIGN=MIDDLE  ALT=\"d%2A.0458\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A%281%2F21.834%29 ALIGN=MIDDLE  ALT=\"d%2A%281%2F21.834%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A%281%2F70+%2B+1%2F55+%2B+1%2F75%29+=+d%2F21.834 ALIGN=MIDDLE  ALT=\"d%2A%281%2F70+%2B+1%2F55+%2B+1%2F75%29+=+d%2F21.834\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi/gal<BR>\n" );
document.write( "That's how much of the 100 gallon tank<BR>\n" );
document.write( "you'd use to go <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d ALIGN=MIDDLE  ALT=\"d\"   DISABLED_style= \"max-width:90%; height:auto;\" > mi so you would<BR>\n" );
document.write( "save <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=100+-+21.834+=+78.166 ALIGN=MIDDLE  ALT=\"100+-+21.834+=+78.166\"   DISABLED_style= \"max-width:90%; height:auto;\" > gallons<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=78.166%2F100 ALIGN=MIDDLE  ALT=\"78.166%2F100\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 78.166% saved<BR>\n" );
document.write( "--------------------------------<BR>\n" );
document.write( "I can check this by converting to decimals:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A%281%2F70+%2B+1%2F55+%2B+1%2F75%29+=+d%2A%28.04286+%2B+.01818+%2B+.01333%29 ALIGN=MIDDLE  ALT=\"d%2A%281%2F70+%2B+1%2F55+%2B+1%2F75%29+=+d%2A%28.04286+%2B+.01818+%2B+.01333%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A.04579 ALIGN=MIDDLE  ALT=\"d%2A.04579\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2A%281%2F21.836%29 ALIGN=MIDDLE  ALT=\"d%2A%281%2F21.836%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Close enough </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );