document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=892888>Question 892888</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a  father was 30 years old when his son was born,he is now 3 times as old as his son.Find their present age.In how many years will the son be half as old as his father. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #540988 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=540988\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a father was 30 years old when his son was born,he is now 3 times as old as his son.Find their present age.In how many years will the son be half as old as his father.<BR>\n" );
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document.write( "let x=son's present age<BR>\n" );
document.write( "30+x=father's present age<BR>\n" );
document.write( "..<BR>\n" );
document.write( "30+x=3x<BR>\n" );
document.write( "2x=30<BR>\n" );
document.write( "x=15<BR>\n" );
document.write( "30+x=45<BR>\n" );
document.write( "son's present age=15<BR>\n" );
document.write( "father's present age=45<BR>\n" );
document.write( "..<BR>\n" );
document.write( "let y=years son will be half as old as his father<BR>\n" );
document.write( "15+y=(45+y)/2<BR>\n" );
document.write( "30+2y=45+y<BR>\n" );
document.write( "y=15<BR>\n" );
document.write( "In how many years will the son be half as old as his father. 15 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );