document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=432339>Question 432339</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A father is three times as old as his son. Four years ago, he was four times as old as his son was at that time. How old is his son?\r<BR>\n" );
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document.write( "...i know it's easy but i already forget it because of chemistry my favorite subject.haha </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #299798 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=299798\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> son's age x												<BR>\n" );
document.write( "father's age	3x									<BR>\n" );
document.write( "4 years ago											<BR>\n" );
document.write( "son's age x-4										<BR>\n" );
document.write( "father's age3x-4								<BR>\n" );
document.write( "father   4	times older											<BR>\n" );
document.write( "3x-4=4(x-4)		<BR>\n" );
document.write( "3x-4=4x	-16				<BR>\n" );
document.write( "-x=-16-4					<BR>\n" );
document.write( "-x=-12								<BR>\n" );
document.write( "x=12	son's age								<BR>\n" );
document.write( "		 </SPAN>\n" );
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