To make a cardboard table for her dollhouse, Quisie uses a rectangular piece of cardboard measuring 40 inches wide and 60 inches long. She cuts four equal-sized squares from each corner and folds down the sides at a 90 degree angle. If the top of the table measures 800 square inches, how tall, in inches is the table?
The answer is 10. I don't understand what the problem is asking me to do. The answer explanation says to plug in the answer choices, but I can't get a visual of the problem.