Answer :

First, convert 3 tons to ounces. 
3 tons = 96,000 ounces. Divide this by 12 ounces.
96,000/12 = 8000
So, 8000 boxes can be filled each week!
Hope this helps!!
3 ton= 96000 ounces/12 ounces= 8000 (Is the answer!)
Have a nice day!