document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=452064>Question 452064</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a baker purchased 12 lb of wheat flour and 15 lb of rye flour for a total cost of 18.30. a second purchase, at the same prices, included 15 lb of wheat flour and 10 lb of rye flour. the cost of the second purchase was 16.75. find the cost per pound of the wheat flour and of the rye flour. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #310754 by </B><A HREF=/tutors/aboutme.mpl?userid=pedjajov><B>pedjajov(51)</B></A><img src=\"/images/stars/stars-08.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=pedjajov><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=310754\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> w - amount of wheat purchased<BR>\n" );
document.write( "r - amount of rye   purchased\r<BR>\n" );
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document.write( "12w+15r=18.30 /*2<BR>\n" );
document.write( "15w+10r=16.75 /*3\r<BR>\n" );
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document.write( "24w+30r=36.60, subtract this equation from the other one<BR>\n" );
document.write( "45w+30r=50.25\r<BR>\n" );
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document.write( "21w=13.65<BR>\n" );
document.write( "w=13.65/21<BR>\n" );
document.write( "w=0.65 is a cost per pound for wheat flour\r<BR>\n" );
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document.write( "From the first equation we have<BR>\n" );
document.write( "r=(18.30-12w)/15<BR>\n" );
document.write( "r=(18.30-12*0.65)/15<BR>\n" );
document.write( "r=0.70 is a cost per pound for rye flour </SPAN>\n" );
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