Johnny is walking home. He has $300 to bring home to his mom. While he is walking, a man stops him and gives him a chance to double his money.
The man says, “I’ll give you $600 if you can roll 1 die and get a 4 or above, you can roll 2 dice and get a 5 or 6 on at least one of them, or you can roll 3 dice and get a 6 on at least one die. If you don’t I get your $300.”
What does Johnny do to have the best chance of getting home with the money?
Riddle AnswerYou are trapped in a room with no food.
After 2 days, you are given 4 bottles of milk out of which one bottle is poisonous.
There is a rat in the room and to find out which bottle is poisonous you can feed milk samples to that rat. But the challenge is that the poison takes effect exactly 10 hours from feeding.
You have only 24 hours in your hand within which you must consume 3 bottles of milk to satisfy your hunger or else you will die.
What strategy would ensure that you drink 3 bottles of milk within 24 hours and survive?
Feed the rat with milk from one bottle every 1 hour. In this way, if the rat dies after 10 hours, then the first bottle is poisonous.
If the rat does not die after 10 hours, you can drink from milk from the first bottle.
Similarly, if the rat dies after 11 hours, then the second bottle is poisonous, if it dies in 12 hours, the third bottle is poisonous.
However, if the rat doesn’t die even after 12 hours, then the fourth bottle is poisonous and you need not test further.
In this way, you will need a maximum of 12 hours to drink 3 bottles of milk.
Our man Ostap was going home from Kiev. He rode halfway by train – fifteen times as fast as he goes on foot. The second half he went by ox team. He can walk twice as fast as that. Would he have saved time if he had gone all the way on foot? If so, by how much?
Yes. He took as much time for the second half of his trip as the whole trip would have taken on foot.
So no matter how fast the train was, he lost exactly as much time as he spent on the train. He would have saved 1⁄30 of the time by walking all the way.
A boy was carrying a basket of eggs. He fell down and all the eggs broke. When he went back home without any eggs his mother asked how many he had been carrying altogether in the basket. He was unable to remember.
But he was able to recall that when they were counted two at a time one was left, when counted three at a time one was left, when counted four at a time one was left, when counted five at a time none were left.
Can you tell how many eggs were broken?
Riddle Answer