document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=629007>Question 629007</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a teacher is four times as old as a student. in 12 years, the student's age will be half of the teacher's age.  how old are they now </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #395979 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=395979\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a teacher is four times as old as a student. in 12 years, the student's age will be half of the teacher's age. how old are they now<BR>\n" );
document.write( "-----<BR>\n" );
document.write( "Equations:<BR>\n" );
document.write( "t = 4s<BR>\n" );
document.write( "s+12 = (1/2)(t+4)<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Substitute for \"t\" and solve for \"s\":<BR>\n" );
document.write( "s + 12 = (1/2)(4s+4)<BR>\n" );
document.write( "s + 12 = 2s + 2<BR>\n" );
document.write( "s = 10 (students's age now)<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Solve for \"t\":<BR>\n" );
document.write( "t = 4s<BR>\n" );
document.write( "t = 40 (teacher's age now)<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=========== </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );