document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=979315>Question 979315</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Present age ratio of father and his son is 2:1.Before 10 years age ratio of them is 5:2.<BR>\n" );
document.write( "What is the present age of son? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #600590 by </B><A HREF=/tutors/aboutme.mpl?userid=Cromlix><B>Cromlix(4381)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Cromlix><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=Cromlix><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=600590\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> hi there,<BR>\n" );
document.write( "Present age ratio of father and his son is 2:1.<BR>\n" );
document.write( "F/S = 2/1<BR>\n" );
document.write( "Cross multiply<BR>\n" );
document.write( "F = 2S<BR>\n" );
document.write( "Before 10 years age ratio of them is 5:2.<BR>\n" );
document.write( "F - 10/S - 10 = 5/2<BR>\n" );
document.write( "Cross multiply <BR>\n" );
document.write( "5S - 50 = 2F - 20<BR>\n" );
document.write( "Replace F with 2S from first equation<BR>\n" );
document.write( "5S - 50 = 2(2S) - 20<BR>\n" );
document.write( "Multiply out<BR>\n" );
document.write( "5S - 50 = 4S - 20<BR>\n" );
document.write( "Collect like terms<BR>\n" );
document.write( "5S - 4S = - 20 + 50<BR>\n" );
document.write( ".........S = 30<BR>\n" );
document.write( "Present age of son = 30 years old<BR>\n" );
document.write( "Hope this helps:-) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );