You are standing next to three switches. You know these switches belong to three bulbs in a room behind a closed door – the door is tight closed, and heavy which means that it's absolutely impossible to see if any bulb is on or not. All three switches are now in position off.
You can do whatever you want with the switches and when you are finished you open the door and go into the room. While in there you have to tell which switch belongs to which bulb.
How will you do that?
Turn on the first switch and wait for a while.
Turn off the first one and turn on the second.
Go into the room.
One bulb is shining, the second bulb is hot and the third one nothing.
Throw away the outside and cook the inside, then eat the outside and throw away the inside. What is it?
Corn on the cob, because you throw away the husk, cook and eat the kernels, and throw away the cob.cleanlogicmath
A 400 yard long train, travelling at 30 mph, enters a 4.5 mile long tunnel.
How long will elapse between the moment the front of the train enters the tunnel and the moment the end of the train clears the tunnel?
9 minutes and 27.2727 seconds.cleanshort
It's red, blue, purple and green. No one can reach it, not even the queen.
When a girl slips on the ice, why can't her brother help her up?
He can't be a brother and assist her (a sister).cleanshort
What goes up and down the stairs without moving?
It is greater than god, more evil than the devil, the poor have it, the rich need it, and if you eat it, you will die? What is it?
You just bought a cute rabbit at a pet store. The rabbit can breed once every month, and deliver 7 babies at a time. How many rabbits do you have after 12 months?
One, it takes two rabbits to breed.logicshort
A man had a book that was worth $40,000. There were only 2 books in existence. He threw it in the furnace, reducing it to a pile of soot. Why did he do this?
He destroyed the book because he has two, and by only having one, the value goes up.logicmathshort
Using eight eights and addition only, can you make 1000?
888 + 88 + 8 + 8 + 8 = 1000