So the important thing is relevant information vs irrelevant. We have 4 pieces of info:
- 9 boxes
- 30 inches high boxes
- 26 bags per box
- 42 ounces per bad
We want how many ounces of cat treats so what information is important, the ounces in each bag is obvious, the numbers of bags, and how many boxes. The inches is information we have but we do not need.
So now we just do multiplication:
42 ounces per bag * 26 bags per box * 9 boxes = 9828 ounces