The first time I was presented with the clock question I blew all the other candidates out of the water by asking for a piece of paper and solving the puzzle. It's not difficult, the idea of questions like this is often to test how well candidates can think on their feet when something unexpected comes along. Nobody knows how many cars there are on the road network right now, or how many windows there are in New York or similar, but it's possible to take a best guess based on some guesstimates. You know, if there are 10m people in the city, living two to a property that makes 5m properties, times four windows per property makes 20m windows, plus maybe another 10m for offices, total 30m windows. Could be way off the mark, the interviewer probably wants to see some form of thought process rather than a blank look and an answer that boils down to "no idea"
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