Question 1003437
Call x the number of pounds of 0.85 nuts used.
Then 60-x must be the amount of 0.55 nuts used.
The setup is then
.85x + .55(60-x) = 60(.75)
.85x + 33 - .55x = 45
.3x + 33 = 45
.3x = 12
x = 40 pounds at .85
60-x = 20 pounds at .55