Remember the weird questions they used to ask in interviews like how many windows are there in New York or how many golf balls can you fit in a bus? Turns out they have a name for such problems: Fermi Problem.

The name comes from a Physicist Enrico Fermi who used to make back-of-the-envelope calculations for such estimation problems. The goal of the problem is not to find the exact answer but to use critical thinking and approximation to reach an answer. The how matters more than the what here.