document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=144863>Question 144863</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0321131940/algebrahomeworkh>Basic Mathematics with Calculus</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> In the design of a bridge, an engineer determines that four fewer 18-m girders are needed for the span length than 15-m girders. How many 18-m girders are needed? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #105570 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=105570\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> L, the length is<BR>\n" );
document.write( "x times 15, or<BR>\n" );
document.write( "x-4 times 18<BR>\n" );
document.write( "So, 15x = 18(x-4)<BR>\n" );
document.write( "15x = 18x-72<BR>\n" );
document.write( "-3x = -72<BR>\n" );
document.write( "x = 24<BR>\n" );
document.write( "15 of the 24' girders = 360 feet.<BR>\n" );
document.write( "18 of the 20' girders = 360 feet.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );