document.write( "Question 344039: the bean counter charges $9.00 per pound for kenya french roast coffee and $8.00 per pound for sumatran coffee. How much of each type should be used to make a 20-lb blend that sells for $8.40? \n" ); document.write( "
Algebra.Com's Answer #246136 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
the bean counter charges $9.00 per pound for kenya french roast coffee and $8.00 per pound for sumatran coffee. How much of each type should be used to make a 20-lb blend that sells for $8.40?
\n" ); document.write( "----------------------
\n" ); document.write( "Quantity: f + s = 20 lb.
\n" ); document.write( "---
\n" ); document.write( "Value::: 9f +8s = 8.4*20
\n" ); document.write( "--------------------------------
\n" ); document.write( "Multiply thru 1st by 90.
\n" ); document.write( "Multiply thru 2nd by 10.
\n" ); document.write( "-----------------------------------
\n" ); document.write( "90f + 90s = 90*20
\n" ); document.write( "90f + 80s = 84*20
\n" ); document.write( "-------------------------
\n" ); document.write( "Subtract 2nd from 1st and solve for \"s\":
\n" ); document.write( "10s = 6*20
\n" ); document.write( "s = 12 lb (amt. of sumatran coffee needed in the mixture)
\n" ); document.write( "----
\n" ); document.write( "Since f+s = 20, f = 8 lb (amt. of french coffee needed in the mixture)
\n" ); document.write( "==================================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( " \n" ); document.write( "
\n" );