document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=549169>Question 549169</A>: <I><SPAN STYLE=\"word-break: break-all;\"> jim is now three times as old as amy. four years ago, jim was seven times as old as amy was then. Find their present ages. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #357510 by </B><A HREF=/tutors/aboutme.mpl?userid=oberobic><B>oberobic(2304)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=oberobic><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=357510\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> J = Jim's age<BR>\n" );
document.write( "A = Amy's age<BR>\n" );
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document.write( "Jim is 3 times as old as Amy.<BR>\n" );
document.write( "J = 3*A<BR>\n" );
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document.write( "Four years ago:<BR>\n" );
document.write( "J-4 = Jim's age<BR>\n" );
document.write( "A-4 = Amy's age<BR>\n" );
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document.write( "Four years ago, Jim was 7 times as old as Amy.<BR>\n" );
document.write( "J-4 = 7*(A-4)<BR>\n" );
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document.write( "Substitute J=3*A<BR>\n" );
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document.write( "3A-4 = 7A - 28<BR>\n" );
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document.write( "3A -7A = -28 + 4<BR>\n" );
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document.write( "-4A = -24<BR>\n" );
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document.write( "A = 6<BR>\n" );
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document.write( "J = 3*A = 3*6 = 18<BR>\n" );
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document.write( "Check how old they were 4 years ago.<BR>\n" );
document.write( "A = 6-4 = 2<BR>\n" );
document.write( "J = 18-4 = 14<BR>\n" );
document.write( "14 = 7*2 ?<BR>\n" );
document.write( "Correct.<BR>\n" );
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document.write( "Answer: Amy is 6, and Jim is 18.<BR>\n" );
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document.write( "Done. </SPAN>\n" );
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