Question 333323
coffee A worth $10. per kilogram 
coffee B worth $12. per kilogram. 
mixture is to sell for $11. per kilogram. 
480 kilogram mixture.
...
coffee A quantity be x kg  $10
coffee B quantity will be 480-x kg. $12
Mixture $11 480 kg
..
10x+12(480-x)= 11*480
10x+5760-12x=5280
-2x=5280-5760
-2x=-480
x= 240 kg Coffee A
Coffee B = 240 kgs.