document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1202518>Question 1202518</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose that the distance a car travels varies directly with the amount of gasoline it uses. A certain car uses 9 gallons of gasoline to travel 207 miles. How many miles can the car travel if it has 13 gallons of gasoline? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #837413 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=837413\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "If you need to find the exact formula, to be used repeatedly, relating distance and gallons of gas, then you want to find the constant of proportionality, as shown in the responses from the other tutors.<br><BR>\n" );
document.write( "However, if you are only required to solve this particular problem, doing the work to find that constant is extra unnecessary effort.<br><BR>\n" );
document.write( "Since the variation is direct, the factor by which the distance changes will be the same as the factor by which the number of gallons of gas changes.  So the answer is the result of a single simple calculation:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=207%2A%2813%2F9%29=%28207%2A13%29%2F9=%28207%2F9%29%2A13=23%2A13=299 ALIGN=MIDDLE  ALT=\"207%2A%2813%2F9%29=%28207%2A13%29%2F9=%28207%2F9%29%2A13=23%2A13=299\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "ANSWER: 299 miles<br><BR>\n" );
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