A snail climbs up a 30-foot wall. Every day it climbs 3 feet, but every night it slips back 2 feet. On which day does the snail reach the top?
28
On day 28, the snail reaches 28 feet. During that same day, it climbs 3 feet to reach 31 feet, cresting the top before it can ever slip back at night.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Medium. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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