Question 1001161
Call the amount of 76% peanuts, x.
The amount of 12% would then be 11-x.
The setup looks like this 
76(x)+12(11-x)= 11(47)
Now solve this.
76x + 132 - 12x = 517
64x = 385
x = 6.016 lbs of 76%
11-x = 4.984 lbs of 12%