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.
(editiert)
Sometimes you have to make obvious assumptions or at least start with those.
You also always have to consider that for questions like this, a correct answer isn't the (mail) goal, but rather how you approach it. You can have different ways of answering a question that the interviewers will appreciate the same.
For instance, the elephant question was answered here (https://www.preplounge.com/en/consulting-forum/case-how-many-elephants-are-there-1056 ) and they made different assumptions
