document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=936779>Question 936779</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ruby is 5 years older than Paula. She is also 7 years older than Shelly. The sum of their ages is 21. How old is each person? Justify your answer. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #570262 by </B><A HREF=/tutors/aboutme.mpl?userid=Edwin+McCravy><B>Edwin McCravy(20056)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Edwin+McCravy><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=Edwin+McCravy><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=570262\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=system%28R=P%2B5%2CR=S%2B7%2CR%2BP%2BS=21%29 ALIGN=MIDDLE  ALT=\"system%28R=P%2B5%2CR=S%2B7%2CR%2BP%2BS=21%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Substitute (P+5) for R in the 2nd and 3rd.<BR>\n" );
document.write( "Solve the 2nd for S<BR>\n" );
document.write( "Substitute that for S in the 3rd<BR>\n" );
document.write( "Substitute back to find P and R.\r<BR>\n" );
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document.write( "Solutions: P=6, R=11, S=4\r<BR>\n" );
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document.write( "Edwin</pre>   </SPAN>\n" );
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