document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=696869>Question 696869</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Five years ago I was thrice as old as my son and ten years later I shall be twice as old as my son. How old are we now? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #429411 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=429411\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Five years ago I was thrice as old as my son and ten years later I shall be twice as old as my son. How old are we now?<BR>\n" );
document.write( "let x=son's age now<BR>\n" );
document.write( "5 yrs ago:<BR>\n" );
document.write( "x-5=son's age<BR>\n" );
document.write( "3(x-5)=parent's age<BR>\n" );
document.write( "10 yrs later:<BR>\n" );
document.write( "x+10=son's age<BR>\n" );
document.write( "2(x+10)=parent's age<BR>\n" );
document.write( "parent's age 10 yrs later=parent's age 5 yrs ago plus 15<BR>\n" );
document.write( "2(x+10)=15+3(x-5)<BR>\n" );
document.write( "2x+20=15+3x-15<BR>\n" );
document.write( "x=20<BR>\n" );
document.write( "3(x-5)+5=50<BR>\n" );
document.write( "son's age now: 20<BR>\n" );
document.write( "parent's age now: 50 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );