document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=860573>Question 860573</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 12 years, a man will be three times as old as his son; the difference of their present ages is 30, find 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 #518514 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=518514\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In 12 years, a man will be three times as old as his son; the difference of their present ages is 30, find their present ages<BR>\n" );
document.write( "***<BR>\n" );
document.write( "at present:<BR>\n" );
document.write( "let x=son's age<BR>\n" );
document.write( "30+x=father's age<BR>\n" );
document.write( "...<BR>\n" );
document.write( "12 years hence:<BR>\n" );
document.write( "x+12=son's age<BR>\n" );
document.write( "30+x+12=42+x=father's age<BR>\n" );
document.write( "...<BR>\n" );
document.write( "42+x=3(x+12)<BR>\n" );
document.write( "42+x=3x+36<BR>\n" );
document.write( "2x=6<BR>\n" );
document.write( "x=3<BR>\n" );
document.write( "30+x=33<BR>\n" );
document.write( "...<BR>\n" );
document.write( "son's present age=3<BR>\n" );
document.write( "father's present age=33 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );