document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1067621>Question 1067621</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mum is 28 years older than Anthony. Mum is 4 years younger than dad. The three of them have a total age of 84 years. How old is each person? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #682797 by </B><A HREF=/tutors/aboutme.mpl?userid=LinnW><B>LinnW(1048)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=LinnW><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=LinnW><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=682797\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let m = Mum's age<BR>\n" );
document.write( "d = Dad's age<BR>\n" );
document.write( "a = Anthony's age<BR>\n" );
document.write( "m = a + 28<BR>\n" );
document.write( "d = m + 4<BR>\n" );
document.write( "Substitute (a + 28) for m in d = m + 4<BR>\n" );
document.write( "d = (a + 28) + 4<BR>\n" );
document.write( "d = a + 32<BR>\n" );
document.write( "a + m + d = 84<BR>\n" );
document.write( "a + (a + 28) + (a + 32) = 84<BR>\n" );
document.write( "3a + 60 = 84<BR>\n" );
document.write( "subtract 60 from each side<BR>\n" );
document.write( "3a = 24<BR>\n" );
document.write( "divide each side by 3<BR>\n" );
document.write( "a = 8<BR>\n" );
document.write( "Since m = a + 28, m = 8 + 28 = 36<BR>\n" );
document.write( "Since d = a + 32, d = 8 + 32 = 40\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );