document.write( "Question 332969: Sales of Pharmaceuticals. In 2004, the Diabetic Express
\n" ); document.write( "charged $27.06 for a vial of Humulin insulin and $34.39
\n" ); document.write( "for a vial of Novolin Velosulin insulin. If a total of
\n" ); document.write( "$1565.57 was collected for 50 vials of insulin, how
\n" ); document.write( "many vials of each type were sold? \n" ); document.write( "
Algebra.Com's Answer #238605 by benazir.sj@gmail.com(109)\"\" \"About 
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Let vial of Humulin insulin be X
\n" ); document.write( "and
\n" ); document.write( "vial of Novolin Velosulin insulin be Y
\n" ); document.write( " X+Y=50
\n" ); document.write( "x=50 -Y--------------->(1)
\n" ); document.write( "cost of vial of Humulin insulin =$27.06
\n" ); document.write( "cost of vial of Novolin Velosulin insulin = $34.39
\n" ); document.write( "total cost = $1565.57
\n" ); document.write( "ie,
\n" ); document.write( "$27.06X +$ 34.39 Y =$1565.57-------------->(2)
\n" ); document.write( "from (1)we know
\n" ); document.write( "X=50-Y\r
\n" ); document.write( "\n" ); document.write( "$27.06(50-Y) +$34.39Y= $1565.57
\n" ); document.write( "27.06*50 -27.06Y +34.39Y =1565.57
\n" ); document.write( "1353 +7.33Y=1565.57
\n" ); document.write( "7.33Y=1565.57 -1353
\n" ); document.write( "7.33Y= 212.57
\n" ); document.write( "Y= 29
\n" ); document.write( "x=50-Y
\n" ); document.write( "x=50-29 =21\r
\n" ); document.write( "\n" ); document.write( "Number of Humulin insulin =21
\n" ); document.write( "and
\n" ); document.write( "Number of Novolin Velosulin insulin =29 \n" ); document.write( "
\n" );