document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1144239>Question 1144239</A>: <I><SPAN STYLE=\"word-break: break-all;\"> David Is 6 years older than his sister Delia. In 10 years the sum of There age 52. how old are David and Delia <BR>\n" );
document.write( " today </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #765275 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=765275\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Something like this, if you want/need to use formal algebra....<br><BR>\n" );
document.write( "L = Delia now<BR>\n" );
document.write( "L+6 = David now<br><BR>\n" );
document.write( "L+10 + Delia 10 years from now<BR>\n" );
document.write( "L+16 = David 10 years from now<br><BR>\n" );
document.write( "(L+10)+(L+16) = 52<br><BR>\n" );
document.write( "Solve using basic algebra.<br><BR>\n" );
document.write( "Or informally....<br><BR>\n" );
document.write( "Sum of their ages 10 years from now is 52.<BR>\n" );
document.write( "So sum of their ages now is 52-20 = 32.<BR>\n" );
document.write( "Subtract 6 years from David's age to make them the same age; the sum of their ages is now 32-6 = 26.<BR>\n" );
document.write( "Then Delia's age is 26/2 = 13.<BR>\n" );
document.write( "Add the 6 years back on to David's age to find out he is 13+6 = 19. </SPAN>\n" );
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