document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1004251>Question 1004251</A>: <I><SPAN STYLE=\"word-break: break-all;\"> there were some birds & deer in a zoo. if heads are counted, they are 200 & if legs are counted they are 580. how many birds are there? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #620787 by </B><A HREF=/tutors/aboutme.mpl?userid=fractalier><B>fractalier(6550)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fractalier><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=fractalier><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=620787\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Call the number of birds and deer, b and d.<BR>\n" );
document.write( "From the facts of the problem<BR>\n" );
document.write( "b + d = 200<BR>\n" );
document.write( "and<BR>\n" );
document.write( "2b + 4d = 580<BR>\n" );
document.write( "We can solve this a couple of ways, but let's multiply the first equation by two and subtract it from the second...<BR>\n" );
document.write( "2b + 4d = 580<BR>\n" );
document.write( "-(2b + 2d = 400)<BR>\n" );
document.write( "and we get<BR>\n" );
document.write( "2d = 180<BR>\n" );
document.write( "d = 90 deer and then<BR>\n" );
document.write( "b = 110 birds </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );