In the early 2000s, Google interviews were brutal. Candidates faced - interviews over - months. Brain teasers like "How many golf balls fit in a 747?" were common.
In 2013, Laszlo Bock told The New York Times: "We found that brainteasers are a complete waste of time. They don't predict anything. They serve primarily to make the interviewer feel smart."
Google analyzed tens of thousands of interviews and found zero correlation between brain teaser performance and job performance. They dropped the questions entirely.