Question 10 is a situation / behavior / analysis question in disguise, sometimes called a Fermi problem but that doesn't say why it's useful. Question 10 with

Question 10 is a situation / behavior / analysis question in disguise, sometimes called a Fermi problem but that doesn't say why it's useful. Question 10 with a 'walk me through the thinking' reveals aptitude for modeling and dimensional analysis, but at a higher level, shows ability to break complex problems down into many simpler and easier to solve problems. That is the essence of dev. It shows thinking through and around the problem, identifying the first component to pull out, revealing key threads to other components, that together tell you if you're in the ballpark on modeling and analysis. All dev is breaking problems down well. A thinking aloud response to 10 reveals a lot. The estimate itself (the Fermi part) isn't actually what matters.