document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=225315>Question 225315</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a father is 3 times as old as his son.  15 years ago, the father was 9 times as old as his son was then. Find thier present ages. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #168163 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=168163\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> \"a father is 3 times as old as his son\" ___ f = 3s\r<BR>\n" );
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document.write( "\"15 years ago, the father was 9 times as old as his son was then\" ___ f-15 = 9(s-15)\r<BR>\n" );
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document.write( "substituting ___ 3s - 15 = 9(s-15)\r<BR>\n" );
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document.write( "distributing ___ 3s - 15 = 9s - 135\r<BR>\n" );
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document.write( "adding 135-3s ___ 120 = 6s\r<BR>\n" );
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document.write( "dividing by 6 ___ 20 = s\r<BR>\n" );
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document.write( "substituting ___ f = 3(20) = 60 </SPAN>\n" );
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