You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

What number divided by 4 is the same as that number minus 4?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

What goes through cities and fields, but never moves?

Find the missing number in the sequence below:

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Which tank will fill first?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.