How many 8 ounce bags of trail mix can be filled from a 10 pound bag of trail mix

16 oz x 10 pounds = 160

160 oz/ 8 oz = 20 bags

You can make 20 8 oz bags because there are 16 oz in 1 lb

Check the picture below.since the segment lf is perpendicular to kn and kn || lm, then lf is also perpendicular to lm, so the  ∡dlm is 90° - 35°, that makes  ∡lmd inside that triangle a 35° angle as you see in the picture.since  ∡m  =  ∡k = 35°, and  ∡m +  ∡n = 180°, then  ∡n = 180° - 35°, or 145°.and since  ∡n =  ∡l = 145°.