Which number should replace the question mark?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

What can go up a chimney down, but can’t go down a chimney up?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

What does this Rebus Picture means ?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

They are three errirs in this question. Can you find them?

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