A snail at the bottom of a 10-foot well climbs up 3 feet every day, but slips down 2 feet every night. How many days will it take the snail to reach the top?
8 days
Net daily gain is 1 foot. After 7 days, the snail is at 7 feet. On the 8th day, it climbs 3 feet to reach 10 feet and escapes before nightfall.
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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