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"Riddle" Riddles - Next 10 of 1323.
Riddle:
Why did the eagle not fly over the sea?
Answer: Because if it flew over the sea it will be a seagull.
Riddle:
You see a boat filled with people. You look again, but this time you don't see a single person on the boat. Why?
Answer: They were all couples!
Riddle:
You have 52 playing cards, 26 red, and 26 black. You draw cards one by one. A red card pays you a dollar. A black one fines you a dollar. You can stop any time you want. Cards are not returned to the deck after being drawn. What is the optimal stopping rule in terms of maximizing your expected payoff? Also, what is the expected payoff following this optimal rule?
Answer: The solution to this problem is, in my opinion the most difficult to understand of all the puzzles. Indeed I was unable to solve it and didn't receive a complete solution until two years after originally posting it. The final solution, in the form of the spreadsheet was sent to me by Han Zheng. For this reason I have left on the page the thoughts i had before I had the final solution as they represent an easier to understand and more simplistic approach. Also the reasoning may help you arrive at the final solution by yourself or help you understand it. I would recommend reading that answer before you dive into the full answer. But an important thing to note are that as the player we can't lose this game as we can gamble till all the cards are drawn and our net position is zero. From our earlier analysis it is clear we need a dynamic quit rule. A singal value is not sufficent. We must, at each stage consider what cards are remaining, and therefor the probability of a positive or negative outcome from drawing again. For the explanation i will ask you first to consider a deck containing only 6 cards, 3 +ve & 3 -ve (note i'm no longer calling the cards black and red, it confuses me.)
Riddle:
Spelled forwards is a type of rodent that you might find in drains, spelled backward is something that you cannot touch but see it everyday at night. What is this word?
Answer: Rats, star.
Riddle:
What goes up when the rain doesn't come down?
Answer: Temperature!
Riddle:
What word begins with E and ends with E, but only has one letter?
Answer: Envelope.
Riddle:
What appears once in a minute, twice in a moment, but not once in a thousand years?
Answer: The letter "M."
Riddle:
I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I?
Answer: An echo.
Riddle:
You are trying to escape a high-tech prison. There are thousands of robots chasing you. You see a table. On the table there is a screwdriver, a water gun and a glass of water. With the screwdriver you could unscrew the vents and climb onto the roof. With the water gun you could shoot the robots. You could throw the glass of water at them. What do you pick up?
Answer: The answer is the glass of water. You pick up the screwdriver and drill into the roof. You climb onto the roof and are seen by CCTV cameras. There are more robots on the roof. You pick up the water gun only to discover there is no water in it. Too bad. You pick up the glass of water and chuck it at the robots. It will give you time to run.
Riddle:
I am an odd number, you take away a alphabet and I become even. What am I?
Answer: 7 (seven;s=even)
