The Prime Number Riddle
Two hundred people in an auditorium are asked to think of a single digit number from 1 to 9 inclusive and write it down. All those who wrote down a prime number are now asked to leave. Ninety people remain behind in the hall. How many of these are expected to have written down an odd number?
Hint: Remember that 1 is not a prime number.
Those that remain behind must have written {1,4,6,8,9} and from this only {1,9} are odd. The probability of an odd number is thus 2/5.
Expected number of odds is 2/5 * 90 = 36 Did you answer this riddle correctly?
YES NO
Expected number of odds is 2/5 * 90 = 36 Did you answer this riddle correctly?
YES NO
The Sinking Boat Riddle
Hint:
An Absentminded Philosopher Riddle
An absentminded philosopher forgot to wind up the only clock in his house. He had no radio, television, telephone, internet, or any other means of ascertaining the time. He therefore decided to travel by foot to his friend's house, a few miles down a straight desert road. He stayed there for the night and when he came back home the following morning, he was able to set his clock to the correct time. Assuming the philosopher always walks at the same speed, how did he know the exact time upon his return? Note: this is not a trick question. The Philosopher did not bring anything to his friend's house, nor did he bring anything back with him on his trip home.
Hint: We can assume that the journey to his friend's and back took exactly the same amount of time.
He Philosopher winds the grandfather clock to a random time right before leaving, 9:00 for example. Although this is not the right time, the clock can now be used to measure elapsed time. As soon as he arrives at his friend's house, the Philosopher looks at the time on his friend's clock. Let's say the time is 7:15. He stays overnight and then, before leaving in the morning, he looks at the clock one more time. Let's say the time is now 10:15 (15 hours later). When the Philosopher arrives home, he looks at his grandfather clock. Let's say his clock reads 12:40. By subtracting the time he set it to when he left (9:00) from the current time (12:40) he knows that he has been gone for 15 hours and 40 minutes. He knows that he spent 15 hours at his friends house, so that means he spent 40 minutes walking. Since he walked at the same speed both ways, it took him 20 minutes to walk from his friend's home back to his place. So the correct time to set the clock to in this example would therefore be 10:15 (the time he left his friend's house) + 20 minutes (the time it took him to walk home) = 10:35. Did you answer this riddle correctly?
YES NO
YES NO
A Man Was Outside Taking A Walk When It Began To Rain
A man was outside taking a walk when it began to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?
Hint:
9 Letters Riddle
What word in English has 9 letters that keeps producing another word when you remove any one letter from it (goes on up to a single letter)?
Hint:
Startling - starting - staring - string - sting - sing - sin - in - I. Did you answer this riddle correctly?
YES NO
YES NO
A Queen's Twins Riddle
A Queen has twins by Caesarean section so it's impossible to tell who was born first. Now the twins are adults and ready to rule. One is intensely stupid, while the other is highly intelligent, well loved and charismatic. Yet the unintelligent one is chosen as the next ruler.
Why?
Why?
Hint:
Blown Up Like A Stick Of Dynamite
I get blown up but Im not a stick of dynamite
I sometimes have a string attached but Im not a kite
I sometimes float but Im not a swimmer
Im seen at birthday parties but Im not a candle
What could I be?
I sometimes have a string attached but Im not a kite
I sometimes float but Im not a swimmer
Im seen at birthday parties but Im not a candle
What could I be?
Hint:
Hot Air Balloon Over The Sahara
One sunny afternoon, three men go for a ride on a hot air balloon over the Sahara desert. An hour into the trip, the balloon begins to lose altitude. A month later, someone found one of the ballooners laying on the desert sand dead, naked, and holding half a toothpick. What happened to him?
Hint:
As the balloon lost altitude, the men took of their clothes and threw them overboard to decrease the weight of the balloon. The balloon continued to drop so the men drew straws to see who would be forced to jump. The dead man in the desert drew the shortest one (the half toothpick). Did you answer this riddle correctly?
YES NO
YES NO
Sweet And Bakes Riddle
I have eyes but I cant see
I have skin but I cant feel anything
I can be sweet but Im not a piece of candy
I can be baked but Im not a cake
I can be peeled but Im not a carrot
What could I be?
I have skin but I cant feel anything
I can be sweet but Im not a piece of candy
I can be baked but Im not a cake
I can be peeled but Im not a carrot
What could I be?
Hint:
Silver Tears Riddle
Silver tears falling down,
Natures clear imposter,
Sparkling, shining like a gown,
Adorn an elephant or horse,
Silver, PVC or even lead,
Bringing cheer to all around,
For such a simple thread.
What are these silver tears?
Natures clear imposter,
Sparkling, shining like a gown,
Adorn an elephant or horse,
Silver, PVC or even lead,
Bringing cheer to all around,
For such a simple thread.
What are these silver tears?
Hint:
Tinsel.
Tinsel emulates icicles, which are like tears and are clear in nature. Tinsel sparkles and shines, and is used to adorn elephants and horses in India. Tinsel is made from silver, PVC and was once made from lead. Tinsel brings back fond memories to many (including myself) and represents far more than a simple metallic thread would normally warrant. Did you answer this riddle correctly?
YES NO
Tinsel emulates icicles, which are like tears and are clear in nature. Tinsel sparkles and shines, and is used to adorn elephants and horses in India. Tinsel is made from silver, PVC and was once made from lead. Tinsel brings back fond memories to many (including myself) and represents far more than a simple metallic thread would normally warrant. Did you answer this riddle correctly?
YES NO
A Man Is Sitting In A House At Night That Has No Lights
A man is sitting in a house at night that has no lights on at all. There is no lamp, no candle, nothing. Yet he is reading. How?
Hint:
A Cruise Between Mexico And The USA Riddle
A man sails off on a cruise between Mexico and the USA. He does not stop at any ports and does not even come out of the cabin, yet he makes $300,000 from his trip. How?
Hint:
Hidden Tiger Riddle
Hint:
Look at the stripes at tiger's body. It's written there. Did you answer this riddle correctly?
YES NO
YES NO
You See A Boat Riddle
You see a boat filled with people. It has not sunk, but when you look again, you don't see a single person there. Why?
Hint:
There Was A Plane Crash Riddle
Hint:
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