Question 1091877
3.10x+8(2.05) = 2.68(x+8)
3.10x+16.40 = 2.68x+21.44
0.42x = 5.04
x = 5.04/0.42 = 12
You have to mix 12 pounds of the premium with 8lbs of the lower grade to get 12+8 = 20lbs at 2.68.