The Cassette Recorder
Imagine a large empty bin where each minute people would come and put in one golf ball a piece.
The first minute (starting at 12 noon), 1 person came and put in a ball.
The second minute, 2 people put in one ball a piece. A minute later, 4 people put in 1 ball a piece.
This pattern continued until the bin was exactly full at 6 PM.
At what time was the bin half empty?
Ah! Click here to read the solution.
5:59 PM, because each minute, the number of balls double. 🙂
Related Brain Teaser: