They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

What jumps when it walks and sits when it stands?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

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.

I look at you, you look at me I raise my right, you raise your left. What am I?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

What has many keys but can’t open a single lock?