document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=257635>Question 257635</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Mary's age is twice Fred's age and one-third of Sally's age. If the sum of their ages is 99,how old are the three friends ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #189520 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=189520\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let:\r<BR>\n" );
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document.write( "m = mary's age<BR>\n" );
document.write( "f = fred's age<BR>\n" );
document.write( "s = sally's age.\r<BR>\n" );
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document.write( "m = 2*f<BR>\n" );
document.write( "m = s/3\r<BR>\n" );
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document.write( "this leads to:\r<BR>\n" );
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document.write( "f = m/2<BR>\n" );
document.write( "s = 3*m\r<BR>\n" );
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document.write( "sume of their ages is 99.\r<BR>\n" );
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document.write( "m + f + s = 99\r<BR>\n" );
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document.write( "substitute for f and s to get:\r<BR>\n" );
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document.write( "m + m/2 + 3*m = 99\r<BR>\n" );
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document.write( "combine like terms to get:\r<BR>\n" );
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document.write( "4*m + m/2 = 99\r<BR>\n" );
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document.write( "since m/2 = .5*m, this becomes:\r<BR>\n" );
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document.write( "4.5 * m = 99\r<BR>\n" );
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document.write( "divide 99 by 4.5 to get m = 22\r<BR>\n" );
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document.write( "f = m/2 = 11\r<BR>\n" );
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document.write( "s = 3*m = 66\r<BR>\n" );
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document.write( "their ages are:\r<BR>\n" );
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document.write( "m = 22<BR>\n" );
document.write( "f = 11<BR>\n" );
document.write( "s = 66\r<BR>\n" );
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document.write( "sum of their ages is 99.\r<BR>\n" );
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document.write( "mary is 22 years old<BR>\n" );
document.write( "fred is 11 years old<BR>\n" );
document.write( "sally is 66 years old\r<BR>\n" );
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document.write( " </SPAN>\n" );
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