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How to answer sizing questions without obvious assumptions?

Anonymous A

I got the strategy to answer market sizing questions like "How many petrol stations are there in city xx"?". You take assumptions like the population, number of cars, number of cars a petrol station can serve, etc. But what about questions like "How many elephants are there in the world?" Despite saying "There are elephants in Africa, Asia and in Zoos", I would not know how to continue.

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