document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=39812>Question 39812</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve E/e=(R+r)/r, solve for r\r<BR>\n" );
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document.write( "E/e =(R/r)+1<BR>\n" );
document.write( "R/r=(E/e)-1<BR>\n" );
document.write( "R/r = (E-e)/e<BR>\n" );
document.write( "r/R=e/(E-e)<BR>\n" );
document.write( "r=Re/(E-e)<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #25254 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=25254\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Takes a little fancy dancing...watch it step-by-step...<BR>\n" );
document.write( "E/e = (R+r)/r<BR>\n" );
document.write( "cross-multiply<BR>\n" );
document.write( "rE = e(R + r)<BR>\n" );
document.write( "rE = eR + er<BR>\n" );
document.write( "rE - er = eR<BR>\n" );
document.write( "r(E - e) = eR<BR>\n" );
document.write( "r = eR / (E - e) </SPAN>\n" );
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