document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=804812>Question 804812</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Derek was 12 years old when his sister was born. Now the sum of their ages is 58. How old is Derek now? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #484958 by </B><A HREF=/tutors/aboutme.mpl?userid=erica65404><B>erica65404(394)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=erica65404><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=erica65404><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=484958\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> D=12+s<BR>\n" );
document.write( "s+D=58<BR>\n" );
document.write( "plug in D<BR>\n" );
document.write( "s+12+s=58<BR>\n" );
document.write( "2s+12=58<BR>\n" );
document.write( "2s=46<BR>\n" );
document.write( "s=23<BR>\n" );
document.write( "plug into D=12+s<BR>\n" );
document.write( "D=12+23<BR>\n" );
document.write( "D=35<BR>\n" );
document.write( "Check answer<BR>\n" );
document.write( "35+23=58<BR>\n" );
document.write( "Derek is 35 and his sister is 23 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );