document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=128175>Question 128175</A>: <I><SPAN STYLE=\"word-break: break-all;\"> matthew is 3 times as old as jenny. In 7 years he will be twice as old as she will be 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 #93866 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=93866\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> m is Matthew's age now.  j is Jenny's age now.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m=3j ALIGN=MIDDLE  ALT=\"m=3j\"   DISABLED_style= \"max-width:90%; height:auto;\" > because Matthew is three times as old as Jenny now.\r<BR>\n" );
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document.write( "In 7 years, Matthew will be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%2B7 ALIGN=MIDDLE  ALT=\"m%2B7\"   DISABLED_style= \"max-width:90%; height:auto;\" > years old, and Jenny will be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=j%2B7 ALIGN=MIDDLE  ALT=\"j%2B7\"   DISABLED_style= \"max-width:90%; height:auto;\" >, and at that time:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%2B7=2%28j%2B7%29 ALIGN=MIDDLE  ALT=\"m%2B7=2%28j%2B7%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > because Matthew will be twice as old as Jenny in 7 years.\r<BR>\n" );
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document.write( "But we know that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m=3j ALIGN=MIDDLE  ALT=\"m=3j\"   DISABLED_style= \"max-width:90%; height:auto;\" > so we can substitute this value into our last equation:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cartoon%28red%28m%29%2B7=2%28j%2B7%29%2Cred%283j%29%2B7=2%28j%2B7%29%29 ALIGN=MIDDLE  ALT=\"cartoon%28red%28m%29%2B7=2%28j%2B7%29%2Cred%283j%29%2B7=2%28j%2B7%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3j%2B7=2%28j%2B7%29 ALIGN=MIDDLE  ALT=\"3j%2B7=2%28j%2B7%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3j%2B7=2j%2B14 ALIGN=MIDDLE  ALT=\"3j%2B7=2j%2B14\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3j-2j=14-7 ALIGN=MIDDLE  ALT=\"3j-2j=14-7\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=j=7 ALIGN=MIDDLE  ALT=\"j=7\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "So Jenny is 7 now, and Matthew is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2A7=21 ALIGN=MIDDLE  ALT=\"3%2A7=21\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "Check:<BR>\n" );
document.write( "In seven years Jenny will be 14 and Matthew will be 28.  28 = 2 * 14.  Answer checks.<BR>\n" );
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