document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=899568>Question 899568</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Maria bought 80 stamps at the post office in 33¢ and 25¢ denominations.  If she paid $24 for the stamps, how many of each denomination did she buy?\r<BR>\n" );
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document.write( "Here is what I tried:\r<BR>\n" );
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document.write( "x=33¢ denomination<BR>\n" );
document.write( "y=25¢ denomination\r<BR>\n" );
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document.write( "x+y=80<BR>\n" );
document.write( "x=-y+80\r<BR>\n" );
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document.write( "33(x)+25(y)=24<BR>\n" );
document.write( "33(-y+80)+25y=2400<BR>\n" );
document.write( "-33y+(-2640)+25y=2400<BR>\n" );
document.write( "Added 2640 to both sides<BR>\n" );
document.write( "8y=50.4<BR>\n" );
document.write( "Divide both sides by 8<BR>\n" );
document.write( "y=6.30\r<BR>\n" );
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document.write( "x=-6.30+80<BR>\n" );
document.write( "x=50.4\r<BR>\n" );
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document.write( "which Ido not think is right but I can not figure what I am doing wrong :(<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #545498 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=545498\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x+y=80,<BR>\n" );
document.write( "33*x+25*y=2400<BR>\n" );
document.write( "x=80-y<BR>\n" );
document.write( "33*(80-y)+25*y=2400<BR>\n" );
document.write( "2640-33y+25*y=2400<BR>\n" );
document.write( "-8*y=-240<BR>\n" );
document.write( "y=30<BR>\n" );
document.write( "x=80-y<BR>\n" );
document.write( "x=50 y=30<BR>\n" );
document.write( "check<BR>\n" );
document.write( "50+30=80<BR>\n" );
document.write( "33*x+25*y=2400<BR>\n" );
document.write( "33*50+25*30=2400<BR>\n" );
document.write( "1650+750=2400<BR>\n" );
document.write( "2400=2400<BR>\n" );
document.write( "ok<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );