This is a bit of a sequel to The Bowl Problem, which was one of the first video problems I ever made. But I gave the bowl problem to a group of students and a handful of them were skeptical of measurements taken straight from the video. So, I gave them a chance to solve the problem right in my classroom.
To solve this one, you may want a close-up shot of the cabinet. So, here:
You may also want a close-up shot of the binders. They are basic 1-inch, empty three-ring binders. So, here:
Do your best. Let me know what you find out.