document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=417328>Question 417328</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Student shirts were being sold for $5.00.  Adult shirts were being sold for $20.00.  30 shirts were sold in all and $300.00 was made.  How many student shirts were sold.  \r<BR>\n" );
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document.write( "I know the solution, (20), but I would like to set it up in an equation.  Can you help please? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #292167 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=292167\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> there are two unknowns (A and S) so a system of equations (2)\r<BR>\n" );
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document.write( "A + S = 30 ___ A = 30 - S\r<BR>\n" );
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document.write( "20A + 5S = 300\r<BR>\n" );
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document.write( "substituting the equivalent value for A ___ 20(30 - S) + 5S = 300\r<BR>\n" );
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document.write( "600 - 20S + 5S = 300\r<BR>\n" );
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document.write( "300 = 15S </SPAN>\n" );
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