If it takes 7 machines 7 minutes to make 7 widgets, how long does it take 82 machines to make 82 widgets?
7 minutes (each machine takes 7 minutes per widget)
Before Mt. Everest was discovered, what was the highest mountain in the world?
Mt. Everest. It just wasn’t discovered yet.
What makes this number unique — 8,549,176,320?
It contains each number, zero through nine, in alphabetical order.
What word in the English language is always spelled incorrectly?
Incorrectly.
You’re standing in a hallway with three light switches on the wall, each of which turns on a different lamp inside a closed room. You can’t see inside the room, and you can’t open the door except to enter the room. You can enter the room only once. How can you tell which switch turns on which lamp?
Turn on the 1st switch and keep it on. Then, turn on the 2nd switch and leave it on for one minute. When that minute is up, turn off the 2nd switch and enter the room. One light bulb will be on (1st switch) and one will be off, but still warm (2nd switch). The cold bulb will correspond to the 3rd switch, which you never turned on.