Lemma
MediumLateral thinking
#17 · Puzzles · A gentle trap

The snail and the well

A snail at the bottom of a 10-foot well climbs 3 feet each day, then slips back 2 feet each night. On which day does it first reach the top?

~6 minWritten answer · check your work with LemmaCareful countingWatch the last step
Stuck? A gentle nudge
Something off?
Workspace
Your working

Check your full solution

Attach photos of your pages (up to 3) or one PDF — or check what you typed above. Lemma reads the work and verifies the reasoning, not just the answer.

Your first check today doesn't need an account.

Your photos and PDFs are read once and not stored — only the transcription is kept.