My question about a snail climbing out of a well was closed as off topic and deleted, because
[...] it appears to be a mathematics problem, as opposed to a mathematical puzzle.
A snail finds itself at the bottom of a 30 foot well. It crawls up 3 feet each day, but at night, while sleeping, it slides down 2 feet.
How long does it take for the snail to crawl out of the well?
The snail climbs at a net pace of a foot per 24 hours, so the naive answer would be 30 days.
However, after 27 days, it finds itself at 3 feet from the top. After having crawled the remaining 3 feet on the next day, it's already out of the well and no longer slips down!
This makes the correct answer 28 days.
A recent answer on meta regarding mathematical puzzles reads
[...] that "a-ha!" moment, [as] that's exactly what makes puzzles fun and enjoyable to solve!
and cites chat
Math is not off-topic. But math with no "aha moment" is.
In light of that, I contend that the question about the snail does contain such an a-ha! moment and as such should be on topic.
Can it please be undeleted and re-opened?