document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=985556>Question 985556</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 31 heads and 104 feet, how many dogs and how many birds </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #606414 by </B><A HREF=/tutors/aboutme.mpl?userid=macston><B>macston(5194)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=macston><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=macston><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=606414\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "D=number of dogs; B=number of birds<BR>\n" );
document.write( "D+B=31<BR>\n" );
document.write( "D=31-B<BR>\n" );
document.write( ".<BR>\n" );
document.write( "4D+2B=104 Substitute for D.<BR>\n" );
document.write( "4(31-B)+2B=104<BR>\n" );
document.write( "124-4B+2B=104<BR>\n" );
document.write( "-2B=-20<BR>\n" );
document.write( "B=10 ANSWER 1: There were 10 birds.<BR>\n" );
document.write( "D=31-B=31-10=21 ANSWER 2: There were 21 dogs.<BR>\n" );
document.write( ".<BR>\n" );
document.write( "CHECK:<BR>\n" );
document.write( "4D+2B=104<BR>\n" );
document.write( "4(21)+2(10)=104<BR>\n" );
document.write( "84+20=104<BR>\n" );
document.write( "104=104<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );