When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

I cannot talk, but I always reply when spoken to. What am I?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

To tease, King Akbar told his most clever advisor Birbal to give his daughter one thing that she can eat when hungry, drink if she feels thirsty and can burn if she feels cold. King Akbar was shocked when Birbal gave Akbar's daughter one such thing that satisfies all of the above.

What did Birbal give to Akbar's daughter?

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

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?