document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=718068>Question 718068</A>: <I><SPAN STYLE=\"word-break: break-all;\"> American Economic History can be purchased as a three-volume set for $88 or each volume can be purchased separately for $39. An economics class spent $1641 for 51 volumes. How many three-volume sets were ordered? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #440741 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley79><B>checkley79(3341)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley79><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=440741\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> X+Y=51<BR>\n" );
document.write( "X=51-Y<BR>\n" );
document.write( "39X+(88/3)Y=1641<BR>\n" );
document.write( "39(51-Y)+29.33Y=1641<BR>\n" );
document.write( "1989-39Y+29.33Y=1641<BR>\n" );
document.write( "-9.67Y=1641-1989<BR>\n" );
document.write( "-9.67Y=-348<BR>\n" );
document.write( "Y=-348/-9.67<BR>\n" );
document.write( "Y=36 3 VOLUME SETS WERE BOUGHT.<BR>\n" );
document.write( "X+36=51<BR>\n" );
document.write( "X=51-36<BR>\n" );
document.write( "X=15 SINGLE VOLUME WERE BOUGHT.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( "39*15+(88/3)36=1641<BR>\n" );
document.write( "585+88*12=1541<BR>\n" );
document.write( "585+1056=1541<BR>\n" );
document.write( "1641=1641 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );