document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1091588>Question 1091588</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If r varies jointly as s and t, and r=90 when s=8 and t=15, find r when s=7 and t=12 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #706014 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=706014\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> r=kst, solve for k<BR>\n" );
document.write( "90=k*8*15=120k<BR>\n" );
document.write( "k=3/4<BR>\n" );
document.write( "now use that value of k<BR>\n" );
document.write( "r=0.75*7*12=63<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );