document.write( "Question 260069: Coffee counters charge $9.00 per pound for roast coffee and $8.00 per pound for Sumatran coffee. How much of each type should be used to make a 20lb blend that sells for $8.40 per lb?! \n" ); document.write( "
Algebra.Com's Answer #191497 by dabanfield(803)\"\" \"About 
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Coffee counters charge $9.00 per pound for roast coffee and $8.00 per pound for Sumatran coffee. How much of each type should be used to make a 20lb blend that sells for $8.40 per lb?!\r
\n" ); document.write( "\n" ); document.write( "Let x be the number of pounds of the $9.00 coffee and y the amount of $8.00 coffee in the blend.\r
\n" ); document.write( "\n" ); document.write( "We know then that 1.) x + y = 20 and\r
\n" ); document.write( "\n" ); document.write( "2.) 9.00*x + 8.00*y = 20*8.40\r
\n" ); document.write( "\n" ); document.write( "Substitute x = 20 - y from equation 1.) in equation 2.):\r
\n" ); document.write( "\n" ); document.write( "9*(20-y) + 8*y = 16.8\r
\n" ); document.write( "\n" ); document.write( "Solve the above for y then calculate x = 20-y.\r
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