document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=258631>Question 258631</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a father is four times as old as his son. in twenty years he will be twice as old. how old are they now? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #190411 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=190411\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a father is four times as old as his son. in twenty years he will be twice as old. how old are they now?<BR>\n" );
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document.write( "F = 4S<BR>\n" );
document.write( "(F+20) = 2(S+20)<BR>\n" );
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document.write( "Substitute for \"F\" and solve for \"S\":<BR>\n" );
document.write( "(4S+20) = 2S+40<BR>\n" );
document.write( "2S = 20<BR>\n" );
document.write( "S= 10 yrs old (the son's age)<BR>\n" );
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document.write( "F= 4S = 40 yrs old (the father's age)<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );