Answer: 350/12
I think 29 2/12 can be also true because they didn't simplify the 2/12 to 1/6.
Step-by-step explanation:
You'll have to use the basic formula for volume is length × width × height. The sample box has the area of 23 1/3 which is found by length x width. They give you the height 1 1/4. I am assuming you will need to multiply 23 1/3 by 1 1/4. You'll get 350/12.
If it's simplify further it will be 175/6 or 29 1/6 as a mixed fraction.