document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=121396>Question 121396</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0534404693/algebrahomeworkh>algebra and trigonometry with analiytic geometry</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> A consulting engineer's time is billed at $100 per hour, and her assistant's is billed at $20 per hour. A customer received a bill for $1200 for a certain job. If the assistant worked 3 hours less than the engineer, how much time did each bill on the job? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #89072 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley71><B>checkley71(8403)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley71><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=89072\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 100X+20(X-3)=1200<BR>\n" );
document.write( "100X+20X-60=1200<BR>\n" );
document.write( "120X=1200+60<BR>\n" );
document.write( "120X=1260<BR>\n" );
document.write( "X=1260/120<BR>\n" );
document.write( "X=10.5 HOURS WAS BILLED FOR THE ENGINEER OR:<BR>\n" );
document.write( "100*10.5=$1050 WAS THE ENGINEER'S BILL.<BR>\n" );
document.write( "20(10.5-3)=20*7.5=$150 WAS THE ASSISTANT'S BILL.<BR>\n" );
document.write( "PROOF<BR>\n" );
document.write( "100*10.5+20*7.5=1200<BR>\n" );
document.write( "1050+150=1200<BR>\n" );
document.write( "1200=1200 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );