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felipec  unbelief  1yr ago (felipec.substack.com)   3217 thread views

2+2 = not what you think

felipec.substack.com

Changing someone's mind is very difficult, that's why I like puzzles most people get wrong: to try to open their mind. Challenging the claim that 2+2 is unequivocally 4 is one of my favorites to get people to reconsider what they think is true with 100% certainty.

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If I ask you what’s the result of 22+2, you are most likely going to answer 24, but if I ask you what’s 22:00+2:00, you are likely not going to answer 24:00 (which isn’t a thing)

It's quite common in Japan to see a bar or restaurant with posted hours of operation from 17:00 to 27:00 (i.e. from 5:00 PM to 3:00 AM). 27:00 is valid in the same sense that 27/24 or 400° is valid; we might call it an "improper time."

You also don't specify whether 22:00 is time of day or duration. If it's a duration, then 24:00 is clearly the correct answer.

But 22+2 can be 0.

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