Answer:
the answer is six
Step-by-step explanation:

This result is actually true for any exterior angle. The exterior angle of a triangle is equal to the sum of the two remote angles, and above is a short proof of it.
You just add all of the weight of the contents together. 12 3/4+ 8 1/4 +7, which equals 28 pounds.
6035 theres nothing to take from or add to it