427: More water in Boxes

A closed rectangular box whose dimensions are 8 feet by 5 feet by 3 feet has some water in it. When the box is resting on its smallest face, the water is 5 feet deep. How deep will the water be if the box is resting on its largest face?

source.

406: Bracketology

Here are my three brackets:

Which of these is most useful in determining how many people are playing?

How jealous are you right now?

4: Percent Increase

On the Praxis Exam I took some years ago, there was a question that ran something like this:

The parking lot at the college was a square 100 yards on a side. The lot was increased by paving enough land to make a new square with a side that was 400% bigger. The size of the new lot was what percent of the old lot?
a)  400%
b)  800%
c)  1200%
d)  1600%

So ... what's wrong with this question and those answers?