document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=139492>Question 139492</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/1592009425/algebrahomeworkh></A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> 1. The sum of the ages of John and Jacob is 20 years. Two years from now , one will be thrice as old as the other then. Find their present ages.<BR>\n" );
document.write( "2. The sum of the ages of Manny and Dennis is 47 years. Seven years ago, Manny was twice as old as Dennis was then. How old is each now? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #101701 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><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=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=101701\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1. The sum of the ages of John and Jacob is 20 years. Two years from now , one will be thrice as old as the other then. Find their present ages.<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Jo + Ja = 20<BR>\n" );
document.write( "Jo = (20 - Ja); use for substitution<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Write an equation for the statement:<BR>\n" );
document.write( "\"Two years from now , one will be thrice as old as the other then.\"<BR>\n" );
document.write( "Jo + 2 = 3(Ja + 2)<BR>\n" );
document.write( "Jo + 2 = 3Ja + 6<BR>\n" );
document.write( "Jo = 3Ja + 6 - 2<BR>\n" );
document.write( "Jo = 3Ja + 4<BR>\n" );
document.write( "Substitute (20-Ja) for Jo<BR>\n" );
document.write( "20 - Ja = 3Ja + 4<BR>\n" );
document.write( "20 - 4 = 3Ja + Ja<BR>\n" );
document.write( "16 = 4Ja<BR>\n" );
document.write( "Ja = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=16%2F4 ALIGN=MIDDLE  ALT=\"16%2F4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Ja = 4 yrs<BR>\n" );
document.write( ":<BR>\n" );
document.write( "Jo = 20 - 4 = 16 yrs old<BR>\n" );
document.write( ":<BR>\n" );
document.write( ":<BR>\n" );
document.write( "2. The sum of the ages of Manny and Dennis is 47 years. <BR>\n" );
document.write( "M + D = 47<BR>\n" );
document.write( "M = 47 - D<BR>\n" );
document.write( ";<BR>\n" );
document.write( "Seven years ago, Manny was twice as old as Dennis was then.<BR>\n" );
document.write( "M - 7 = 2(D-7)<BR>\n" );
document.write( ":<BR>\n" );
document.write( " How old is each now?\r<BR>\n" );
document.write( "\n" );
document.write( "Solve this one the same way as we did the 1st one. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );