document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1166099>Question 1166099</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The sum of the ages of Demetrius and Guadalupe is 64 years. 8 years ago Demetrius age was 2 times guadalupes age. How old is Demetrius now?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #790580 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=790580\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Here is one of many ways to set the problem up using formal algebra.<br><BR>\n" );
document.write( "d = Demetrius' age<BR>\n" );
document.write( "g = Guadalupe's age<BR>\n" );
document.write( "d-8 = D's age 8 years ago<BR>\n" );
document.write( "g-8 = G's age 8 years ago<br><BR>\n" );
document.write( "(1) d+g = 64  [the sum of their ages is 64]<BR>\n" );
document.write( "(2) d-8 = 2(g-8)  [Demetrius' age 8 years ago was twice Guadalupe's age then]<br><BR>\n" );
document.write( "Solve the pair of equation by your favorite method....<br><BR>\n" );
document.write( "Without formal algebra....<br><BR>\n" );
document.write( "The sum of their ages now is 64; the sum of their ages 8 years ago was 64-2(8) = 48.<br><BR>\n" );
document.write( "When the sum of their ages was 48, Demetrius was twice as old as Guadalupe; that means their ages were 32 and 16.<br><BR>\n" );
document.write( "That was 8 years ago, so now Demetrius is 40 years old.<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );