document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=705286>Question 705286</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Dave is 4 years older than Billy.  Billy is 3 times older than Jon.  All three of their ages combined is 39.  What is the age of each child?\r<BR>\n" );
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document.write( "I started the problem by trying to figure out Jon's age.  I came up with the answer of 7.  That does not add up correctly.  It looks the answer should be 5.  I need the steps to get to 5.  Trying to help my son with this problem last night and I am stumped.\r<BR>\n" );
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document.write( "Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #434494 by </B><A HREF=/tutors/aboutme.mpl?userid=Stitch><B>Stitch(470)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Stitch><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=434494\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let B = Billy's Age<BR>\n" );
document.write( "Let D = Dave's Age<BR>\n" );
document.write( "Let J = Jon's Age<BR>\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=D+=+B+%2B+4 ALIGN=MIDDLE  ALT=\"D+=+B+%2B+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation 2: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B+=+3J ALIGN=MIDDLE  ALT=\"B+=+3J\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Equation 3: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B+%2B+D+%2B+J+=+39 ALIGN=MIDDLE  ALT=\"B+%2B+D+%2B+J+=+39\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "--------------------------------<BR>\n" );
document.write( "Rewrite equation 2 so that it is solved for J<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B%2F3+=+J ALIGN=MIDDLE  ALT=\"B%2F3+=+J\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now both equation 1 and equation 2 are in terms of B<BR>\n" );
document.write( "Substitue those values into equation 3 for the same letter.<BR>\n" );
document.write( "Equation 3: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B+%2B+D+%2B+J+=+39 ALIGN=MIDDLE  ALT=\"B+%2B+D+%2B+J+=+39\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B+%2B+%28B+%2B+4%29+%2B+%28B%2F3%29+=+39 ALIGN=MIDDLE  ALT=\"B+%2B+%28B+%2B+4%29+%2B+%28B%2F3%29+=+39\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Multiply everything by 3 to remove the denominator<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3B+%2B+3B+%2B+12+%2B+B+=+117 ALIGN=MIDDLE  ALT=\"3B+%2B+3B+%2B+12+%2B+B+=+117\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Combine like terms<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7B+%2B+12+=+117 ALIGN=MIDDLE  ALT=\"7B+%2B+12+=+117\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Subtract 12 from both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7B+=+105 ALIGN=MIDDLE  ALT=\"7B+=+105\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Divide both sides by 7<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28B+=+15%29 ALIGN=MIDDLE  ALT=\"highlight%28B+=+15%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Now plug 15 into the equations 1 and 2 for B.<BR>\n" );
document.write( "---------------------------------------------<BR>\n" );
document.write( "Equation 1: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=D+=+B+%2B+4 ALIGN=MIDDLE  ALT=\"D+=+B+%2B+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=D+=+%2815%29+%2B+4 ALIGN=MIDDLE  ALT=\"D+=+%2815%29+%2B+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green+%28D+=+19%29 ALIGN=MIDDLE  ALT=\"highlight_green+%28D+=+19%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------------------------------------------<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B%2F3+=+J ALIGN=MIDDLE  ALT=\"B%2F3+=+J\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2815%29%2F3+=+J ALIGN=MIDDLE  ALT=\"%2815%29%2F3+=+J\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%285+=+J%29 ALIGN=MIDDLE  ALT=\"highlight%285+=+J%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );