document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=843889>Question 843889</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A father is twice as old as his son. Twelve years ago the father was four times as old as the son was then. Determine their present age </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #508388 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=508388\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A father is twice as old as his son. Twelve years ago the father was four times as old as the son was then. Determine their present age.<BR>\n" );
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document.write( "let x=son's present age<BR>\n" );
document.write( "2x=father's present age<BR>\n" );
document.write( "..<BR>\n" );
document.write( "12 years ago:<BR>\n" );
document.write( "x-12=son's age<BR>\n" );
document.write( "2x-12= father's age<BR>\n" );
document.write( "2x-12=4(x-12)<BR>\n" );
document.write( "2x-12=4x-48<BR>\n" );
document.write( "2x=36<BR>\n" );
document.write( "x=18<BR>\n" );
document.write( "2x=36<BR>\n" );
document.write( "son's present age=18<BR>\n" );
document.write( "father's present age=36 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );