document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=291405>Question 291405</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In an office building, a room contains 90 chairs. The number of chairs per row is three less than three times the number of rows. Find the number of rows and the number of chairs per row.<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #210758 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><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=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=210758\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let r=number of rows, c=number of chairs/row<BR>\n" );
document.write( "cr=90<BR>\n" );
document.write( "c+3=3r<BR>\n" );
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document.write( "c=3r-3<BR>\n" );
document.write( "r(3r-3)=90<BR>\n" );
document.write( "3r^2-3r-90=0<BR>\n" );
document.write( "r^2-r-30=0<BR>\n" );
document.write( "(r-6)(r+5)=0<BR>\n" );
document.write( "r=6<BR>\n" );
document.write( "c=15<BR>\n" );
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document.write( "Ed </SPAN>\n" );
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