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"Door" Riddles - Final 9 of 109
Riddle:
A sign on the barber's door says "I shave only those who do not shave themselves". Does the barber shave himself?
Answer: There is no answer; it's a paradox. It cannot be made to work.
Riddle:
A little house full of meat, no door to go in and eat.
What am I?
Answer: A Nut.
Riddle:
Why do Egyptian pyramids have doorbells?
Answer: So you toot-'n'-come-in.
Riddle:
There are 100 light bulbs lined up in a row in a long room. Each bulb has its own switch and is currently switched off. The room has an entry door and an exit door. There are 100 people lined up outside the entry door. Each bulb is numbered consecutively from 1 to 100. So is each person. Person No. 1 enters the room, switches on every bulb, and exits. Person No. 2 enters and flips the switch on every second bulb (turning off bulbs 2, 4, 6, ...). Person No. 3 enters and flips the switch on every third bulb (changing the state on bulbs 3, 6, 9, ...). This continues until all 100 people have passed through the room. What is the final state of bulb No. 64? And how many of the light bulbs are illuminated after the 100th person has passed through the room?
Answer: First think who will operate each bulb, obviously person #2 will do all the even numbers, and say person #10 will operate all the bulbs that end in a zero. So who would operate for example bulb 48: Persons numbered: 1 & 48, 2 & 24, 3 & 16, 4 & 12, 6 & 8 ........ That is all the factors (numbers by which 48 is divisible) will be in pairs. This means that for every person who switches a bulb on there will be someone to switch it off. This willl result in the bulb being back at it's original state. So why aren't all the bulbs off? Think of bulb 36:- The factors are: 1 & 36, 2 & 13, 6 & 6 Well in this case whilst all the factors are in pairs the number 6 is paired with it's self. Clearly the sixth person will only flick the bulb once and so the pairs don't cancel. This is true of all the square numbers. There are 10 square numbers between 1 and 100 (1, 4, 9, 16, 25, 36, 49, 64, 81 & 100) hence 10 bulbs remain on.
Riddle:
What goes through the door without pinching itself, sits on the stove without burning itself, sits on the table, and is not ashamed?
Answer: The Sun.
Riddle:
You are locked in a house and you have four objects. You have a wooden chair, a ladder, a piano, and a rubber ax. You can only pick one object and you can't get out by breaking anything. What would you use to get out?
Answer: You use the piano KEYS to ulock the door!
Riddle:
A man and a woman were driving in their car when it broke down. The man decided to go for help at a gas station a few miles back. He made sure nobody was in the car, rolled all the windows up, and locked all of the sedan's doors. He went off, but when he came back, his wife was dead, and there was a stranger in the car. No physical damage was done to the car, so how did the stranger get in?
Answer: The stranger was a baby and the woman died in childbirth.
Riddle:
My first is often at the front door. My second is found in the cereal family. My third is what most people want. My whole is one of the United States. What am I?
Answer: MATRIMONY (mat rye money). Which is certainly a "united state"!
Riddle:
If you're in a room with no windows, no doors, and everything made of cement. In the room is a mirror and a table. How do you get out?
Answer: Look in the mirror to see what you saw. Take the saw the table in half. Use the two halves to make a whole. Then, crawl through the hole to get out.
