What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Complete the table series riddle by finding the number that can replace "??".

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

What does a man do only once in his lifetime, but women do once a year after they are 29?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Where do fish keep their money?