An adventurous frog is at the bottom of a 30-foot well. Every day it climbs up 3 feet, but at night it slips back 2 feet. How many days does it take for the frog to reach the top?
28 days
On the 27th day, the frog climbs to 27 feet. On the 28th day, it climbs 3 feet and reaches the 30-foot top, escaping before it can 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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