document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=794721>Question 794721</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I'm trying to help my 7th grader with an algebra problem. Boy...I feel stupid! Here it is.\r<BR>\n" );
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document.write( "A bike shop has a bunch of bikes for sale. The problem asks how many of each bike are available. Here is the information given:\r<BR>\n" );
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document.write( "The shop sells tricycles, bicycles, tandem bikes, and unicycles.\r<BR>\n" );
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document.write( "There are 57 helmets available (one for each rider).<BR>\n" );
document.write( "There are 115 wheels total.<BR>\n" );
document.write( "There are 32 regular bikes.<BR>\n" );
document.write( "There are the same same number of tandem bikes as ther are unicycles.\r<BR>\n" );
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document.write( "That is all the information there is. Thanks for your help!\r<BR>\n" );
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document.write( "Rich </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #480738 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=480738\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> t= tricycle<BR>\n" );
document.write( "b-bicycle<BR>\n" );
document.write( "d= tandem<BR>\n" );
document.write( "u- unicycle\r<BR>\n" );
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document.write( "There are 57 helmets available (one for each rider).<BR>\n" );
document.write( "t+b+2d+u=57<BR>\n" );
document.write( "There are 115 wheels total.<BR>\n" );
document.write( "3t+2b+2d+u=115\r<BR>\n" );
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document.write( "There are 32 regular bikes.<BR>\n" );
document.write( "b=32\r<BR>\n" );
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document.write( "There are the same same number of tandem bikes as there are unicycles.<BR>\n" );
document.write( "d=u\r<BR>\n" );
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document.write( "t+b+2d+u=57\r<BR>\n" );
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document.write( "3t+2b+2d+u=115\r<BR>\n" );
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document.write( "b=32\r<BR>\n" );
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document.write( "d=u\r<BR>\n" );
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document.write( "Substitute in the first equation\r<BR>\n" );
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document.write( "t+32+2d+d=57<BR>\n" );
document.write( "t+3d=25>...............................(1)\r<BR>\n" );
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document.write( "substitute in second equation<BR>\n" );
document.write( "3t+64+2d+d=115\r<BR>\n" );
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document.write( "3t+3d=115-64<BR>\n" );
document.write( "3t+3d=51<BR>\n" );
document.write( "t+d=17..................................(2)\r<BR>\n" );
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document.write( "solve 1 & 2 we get<BR>\n" );
document.write( " d= 4 Tandem bikes<BR>\n" );
document.write( "t+d=17<BR>\n" );
document.write( "t=13.... Tricycles\r<BR>\n" );
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document.write( "u = d <BR>\n" );
document.write( "so u =4 </SPAN>\n" );
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