Question 1050364
Let n be the amount of Kona coffee in the blend. Then:
13.2n+8.6(10-n)=12.74(10)
4.6n+86=127.4
4.6n=41.4
n=9
You need 9 lbs. of Kona coffee, and 1 lb. of Rift Valley coffee for 10 lbs. of mixed coffee at $12.74/lb.. ☺☺☺☺