I wrote a (very long) blog post about those viral math problems and am looking for feedback, especially from people who are not convinced that the problem is ambiguous.
It's about a 30min read so thank you in advance if you really take the time to read it, but I think it's worth it if you joined such discussions in the past, but I'm probably biased because I wrote it :)
Yeah! That's why I mentioned it, it was a fresh ambiguous notation problem that I've never encountered before. Discussions of "is it 1 or 9" get tiring quickly.
At least WA and others tell you how they interpret the input, instead of being a black box (until you get to the manuals). Even though it is obvious in hindsight, I didn't get why two calculators would yield different results; thanks!
Nice write-up.