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Two Mathematicians and a Coin

The king is very angry at his two best mathematicians, so he decrees the following punishment:

The mathematicians will be imprisoned in towers at opposite ends of the kingdom. Each morning, a guard at each tower will flip a coin and show the result to his prisoner. Each prisoner must then guess the result of the coin flip at the other tower. If at least one of the two guesses is correct, they will live another day. But as soon as both guesses are incorrect, they will be executed.

The two mathematicians, as they were being ushered out the door of the castle, came up with a clever plan so that they will always be able to make at least one correct guess. What was their plan?

Riddle Answer

5 Pills

A doctor gives you 5 pills and instructs you to take each at intervals of half an hour. How long will the pills last?

Riddle Answer

Three Missionaries and Three Cannibals

Three missionaries and three cannibals want to get to the other side of a river. There is a small boat, which can fit only two. To prevent a tragedy, there can never be more cannibals than missionaries together.

How can all the cannibals and missionaries cross the river safely ?

Riddle Answer

Baseball Bat and a Ball Cost $1.10

A baseball bat and a ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?

Riddle Answer

100 Prisoners and a Light Bulb

There is a prison with 100 prisoners, each in separate cells with no form of contact. There is an area in the prison with a single light bulb in it. Each day, the warden picks one of the prisoners at random, even if they have been picked before, and takes them out to the lobby. The prisoner will have the choice to flip the switch if they want. The light bulb starts off.

When a prisoner is taken into the area with the light bulb, he can also say “Every prisoner has been brought to the light bulb.” If this is true all prisoners will go free. However, if a prisoner chooses to say this and it’s wrong, all the prisoners will be executed. So a prisoner should only say this if he knows it is true for sure.

Before the first day of this process begins, all the prisoners are allowed to get together to discuss a strategy to eventually save themselves.

What strategy could they use to ensure they will go free?

Riddle Answer

Best Riddles

Two Mathematicians and a Coin

5 Pills

Three Missionaries and Three Cannibals

Baseball Bat and a Ball Cost $1.10

100 Prisoners and a Light Bulb

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