document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=228620>Question 228620</A>: <I><SPAN STYLE=\"word-break: break-all;\"> an aircraft uses 1680 gallons of fuel,the left tank used 45%,the right tank used 32.5%.how nuch was used by centre tank? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #169681 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=169681\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Assuming that there are only three tanks, this means that the percentages must add to 100%. So let 'x' be the unknown percentage used by the center tank. Now add up the percentages and set them equal to 100 to get: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=45%2B32.5%2Bx=100 ALIGN=MIDDLE  ALT=\"45%2B32.5%2Bx=100\"   DISABLED_style= \"max-width:90%; height:auto;\" >. \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Now solve for 'x' to get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=77.5%2Bx=100 ALIGN=MIDDLE  ALT=\"77.5%2Bx=100\"   DISABLED_style= \"max-width:90%; height:auto;\" > ---> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=22.5 ALIGN=MIDDLE  ALT=\"x=22.5\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So the center tank used 22.5% of the fuel. Now just multiply the total amount of fuel (1680) by 0.225 (the decimal representation of 22.5%): 1680*0.225=378\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So the center tank used 378 gallons of fuel. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );