document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1079257>Question 1079257</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The sum of Ann and Fred's age is 28. In seven years time Ann will be twice as old as Fred. How old are they now?<BR>\n" );
document.write( "I need to solve this using simultaneous equations. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #693585 by </B><A HREF=/tutors/aboutme.mpl?userid=htmentor><B>htmentor(1343)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=htmentor><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=htmentor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=693585\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A= Ann's age<BR>\n" );
document.write( "F= Fred's age<BR>\n" );
document.write( "A + F = 28 [sum of their ages]<BR>\n" );
document.write( "A + 7 = 2(F + 7) [Ann will be twice Fred's age in 7 years]<BR>\n" );
document.write( "So we have two equations and two unknowns<BR>\n" );
document.write( "A + F = 28 -> A = 28 - F<BR>\n" );
document.write( "substitute this value into the other equation:<BR>\n" );
document.write( "28 - F + 7 = 2F + 14<BR>\n" );
document.write( "Solve for F:<BR>\n" );
document.write( "3F = 21 -> F = 7<BR>\n" );
document.write( "Therefore A = 21 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );