document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=719374>Question 719374</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A FATHER IS NOW 7 TIMES AS OLD AS HIS SON. IN 5 YEARS, HE WILL BE 4 TIMES AS OLD AS HIS SON WILL BE THEN. WHAT ARE THEIR PRESENT AGES? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #441334 by </B><A HREF=/tutors/aboutme.mpl?userid=mathworm7271><B>mathworm7271(5)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mathworm7271><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=mathworm7271><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=441334\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let's call the fathers age f and the sons age s.<BR>\n" );
document.write( "Write out the formulas.<BR>\n" );
document.write( "F=7S<BR>\n" );
document.write( "F+5=4(S+5)<BR>\n" );
document.write( "Use the Distributive property on the 2nd equation<BR>\n" );
document.write( "F+5=4S+20<BR>\n" );
document.write( "Subtract 5 from both sides<BR>\n" );
document.write( "F=4S+15<BR>\n" );
document.write( "Now substitute<BR>\n" );
document.write( "7S=4S+15<BR>\n" );
document.write( "Subtract 4S from both sides<BR>\n" );
document.write( "3S=15<BR>\n" );
document.write( "Divide both sides by three<BR>\n" );
document.write( "S=5<BR>\n" );
document.write( "Plug in S to the first equation<BR>\n" );
document.write( "F=7(5)=35<BR>\n" );
document.write( "Therefore, the Father's age is 35 and the Son's age is 7 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );