document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=2036>Question 2036</A>: <I><SPAN STYLE=\"word-break: break-all;\">  in a grass field, If there are 40 cows, they could eat for 40 <BR>\n" );
document.write( "days. If there are 30 cows, they could eat for 60 days. Than if 20 <BR>\n" );
document.write( "cows, How much day they could eat? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #829 by </B><A HREF=/tutors/aboutme.mpl?userid=Jessmh123><B>Jessmh123(22)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Jessmh123><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=829\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I am not sure of my solution - but this is how i did it:<BR>\n" );
document.write( "Assume that the rate at which the grass is eaten is partly dependent on the number of cows.<BR>\n" );
document.write( "Then, <BR>\n" );
document.write( "nDays = k1 * nCows + k2<BR>\n" );
document.write( "thus,<BR>\n" );
document.write( "40 = 40k1 + k2<BR>\n" );
document.write( "60 = 30k1 + k2<BR>\n" );
document.write( "Solving for k1, k2;<BR>\n" );
document.write( "k1 = -2, k2 = 120<BR>\n" );
document.write( "Therefore,<BR>\n" );
document.write( "in case of 20 cows:<BR>\n" );
document.write( "nDays = 20*-2 + 120 = 80 days <BR>\n" );
document.write( ":) I hope I helped!<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );