Quantitative skills question

[Stereot]

Hi, everyone!

I'm not new to interviews, but more recently I was asked the kind of question that I rarely get during interviews:

"How many piano tuners are there in Massachusetts?"

Obviously, there's no right or wrong way to answer this (as it designed to test reasoning), but I'm wondering what your approach would be.

Thank you for your help in advance!

[Stereot]

Actually just figured out that its a classic Fermi problem (see Wikipedia > Fermi problem).