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Faulty Streetlights is a puzzle in Professor Layton and the Last Specter.
Puzzle
- US Version
This quiet road is lit by 10 street-lights. Deep in the dead of the night, the lights are blown by a power surge and all the lights are replaced.
Unfortunately, the new bulbs are poor quality--one breaks every two hours. Finding it hard to keep up, the unlucky repairman only manages to bring a replacement bulb every three hours.
How many bulbs will still be lit after 12 hours?
- UK Version
This quiet road is lit by ten streetlights. Deep in the dead of night, the lights are blown by a power surge and all the lights are replaced.
Unfortunately, the new bulbs are poor quality, and one breaks every two hours. Finding it hard to keep up, the unlucky repairman only manages to bring a replacement bulb every three hours.
How many bulbs will still be lit after 12 hours?
Hints
Solution
Incorrect
- US Version
Too bad!
With a bit more thought, you might get a flash of inspiration.
- UK Version
Bad luck!
With a bit more thought, you might get a flash of inspiration.
Correct
- US Version
Very bright of you!
The answer is 0.
After 12 hours, it will no longer be dark outside, so all of the streetlights will be turned off.
- UK Version
What a bright spark!
The answer is none.
After 12 hours, it will no longer be dark outside, so all of the streetlights will be turned off.
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