It gains a foot a day, so by the end of day 27 it’s 27 feet up. On day 28 it climbs the last 3 feet and is out before night can drag it back.
The usual answer is 30, from counting a foot a day all the way to the top.
A snail is at the bottom of a well 30 feet deep. Every day it climbs 3 feet, and every night it slides back 2. On which day does it reach the top?
Give me a hintThe hint
The last day isn’t like the others.
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Day 28
Source: Traditional