Sample Question #140 (brainteaser)
The allegorical frog in the well is finally determined to see the world outside for himself and begins to climb out of the well it’s been living in all its life. The well measures 10 feet deep. The frog climbs three feet a day, but when it sleeps at night, it slides down the wall by one foot. How many days does it take the frog to reach the top?
[A childhood puzzle from my elementary days in China]