The questions are actually quite brilliant. Most of these are from top companies. The fact that they are top companies is no mistake or accident. These questions are unorthodox, but that's why they're so effective. You cannot prepare for "A penguin walks through that door right now wearing a sombrero. What does he say and why is he here?". That's not in any book. There's no textbook, bland answer for that. Hence, your personality, your true skills, and your work ethic will shine through.
Consider Google's question: "How many cows are in Canada?". This is for a data evaluator role. Hence, I assume the person will need a strong base in statistics. This is a difficult statistics question (a Fermi problem), and an unexpected one. They may not be expecting an exact answer, but if you can walk them through the process of obtaining one then they know you are good candidate.
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