document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=858602>Question 858602</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am three times as old as my son. Five years later I shall be two and a half times as old as my son. What is my age? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #517271 by </B><A HREF=/tutors/aboutme.mpl?userid=JulietG><B>JulietG(1812)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=JulietG><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=JulietG><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=517271\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> F = 3S [I am three times as old as my son.]<BR>\n" );
document.write( "F + 5 = 2.5(S+5) [Five years later I shall be two and a half times as old as my son.]<BR>\n" );
document.write( "Substitute the known value of F from the first equation into the second.<BR>\n" );
document.write( "(3S) + 5 = 2.5(S+5)<BR>\n" );
document.write( "Distribute<BR>\n" );
document.write( "3S + 5 = 2.5S + 12.5<BR>\n" );
document.write( "Subtract 2.5S from each side<BR>\n" );
document.write( ".5S + 5 = 12.5<BR>\n" );
document.write( "Subtract 5 from each side<BR>\n" );
document.write( ".5S = 7.5<BR>\n" );
document.write( "Multiply each side by 2 in order to get a full S<BR>\n" );
document.write( "S = 15<BR>\n" );
document.write( ".<BR>\n" );
document.write( "If the son is 15, the father is 45.<BR>\n" );
document.write( "Let's plug it into the equation to make certain it's correct.<BR>\n" );
document.write( "45 + 5 = 2.5 * 20<BR>\n" );
document.write( "50 = 50<BR>\n" );
document.write( "Success! </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );