document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=163684>Question 163684</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 2004, the Diabetic Express charged $27.06 for a vial of Humulin insulin and $34.39 for a vial of Novolin Velosulin insulin. If a total of $1565.57 was collected for 50 vials of insulin, how many vials of each type were sold?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #120592 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=120592\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 34.39x+27.06(50-x)=1,565.57<BR>\n" );
document.write( "34.39x+1,353-27.06x=1,565.57<BR>\n" );
document.write( "7.33x=1,565.57-1,353<BR>\n" );
document.write( "7.33x=212.57<BR>\n" );
document.write( "x=212.57/7.33<BR>\n" );
document.write( "x=29 vials of Novolin were sold.<BR>\n" );
document.write( "50-29=21 vials of Humulin were sold.<BR>\n" );
document.write( "Proof:<BR>\n" );
document.write( "34.39*29+27.06*21=1,565.57<BR>\n" );
document.write( "997.31+568.26=1,565.57<BR>\n" );
document.write( "1,565.57=1,565.57 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );