document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1043631>Question 1043631</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Emily is walking a trail. After walking k percent of the length of the trail.  she has 10 km left to go.  Which of the following represents the length of the trail?  <BR>\n" );
document.write( "A)  10(100-k)<BR>\n" );
document.write( "B)  (100-k)/10<BR>\n" );
document.write( "C)  (10k)/(100-k)<BR>\n" );
document.write( "D)  1000/(100-k) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #658787 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=658787\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The trail is x km long<BR>\n" );
document.write( "at kx, k <1, there is 10 km left, so x-kx=10.<BR>\n" );
document.write( "x(1-k)=10.<BR>\n" );
document.write( "x=10/(1-k)<BR>\n" );
document.write( "Because this is per cent for k, everything has to be multiplied by 100.<BR>\n" );
document.write( "1000/(100-k) would be the answer.<BR>\n" );
document.write( "D<BR>\n" );
document.write( "Check<BR>\n" );
document.write( "Suppose the trail is 25 km long, and she has 10 km left.  She has walked 60 per cent of the trail<BR>\n" );
document.write( "1000/(100-60)=1000/40=25 km.<BR>\n" );
document.write( "------------------------<BR>\n" );
document.write( "If she had walked 20% of the trail and had 10 km left<BR>\n" );
document.write( "1000/(100-20)=12.5 km.  That would mean she had walked 2.5 km (1/5 of 12.5 or 20%) and had 10 km left. </SPAN>\n" );
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