document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=773310>Question 773310</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the father is four times older than his son, if their gap age is 21, what are their age? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #471469 by </B><A HREF=/tutors/aboutme.mpl?userid=ramkikk66><B>ramkikk66(644)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ramkikk66><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=471469\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let son's age be x<BR>\n" );
document.write( "Father's age = 4x<BR>\n" );
document.write( "Gap in ages = 4x - x = 3x<BR>\n" );
document.write( "So 3x = 21<BR>\n" );
document.write( "x = 21/3 = 7<BR>\n" );
document.write( "Son's age = 7 and father's age = 7*4 = 28.<BR>\n" );
document.write( ":)<BR>\n" );
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