document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=492762>Question 492762</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Robert is one half as old as his father. Twelve years ago, Robert was one third as old as his father was then. Find their 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 #335179 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=335179\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Robert is one half as old as his father. Twelve years ago, Robert was one third as old as his father was then. Find their present ages.<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Equations:<BR>\n" );
document.write( "f = 2r<BR>\n" );
document.write( "3(r-12) = (f-12)<BR>\n" );
document.write( "---<BR>\n" );
document.write( "substitute for \"f\" and solve for \"r\":<BR>\n" );
document.write( "3r - 36 = 2r-12<BR>\n" );
document.write( "r = 24 Robert's age now<BR>\n" );
document.write( "----<BR>\n" );
document.write( "f = 2r<BR>\n" );
document.write( "father = 48 yrs old now<BR>\n" );
document.write( "==========================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "stan H.<BR>\n" );
document.write( "================== </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );