Move four matchsticks to the below square to form three squares?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

Find the next number in the series below.

6 18 270 72090 ?

What is always in front of you but can’t be seen?

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

What is so fragile that saying its name breaks it?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

how come the second man dies?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

A dead body is found outside a multi-story multinational company. The case is reported and a homicide detective is called on the crime scene.

He looks at the body and then towards the building. From the position of the body, it is evident that the victim committed suicide. He goes to the first floor of the building and then walks in the direction of the dead body, opens the window and toss a coin in the air.

He goes to second floor and again repeats the process. He keeps doing this till he is done on all the floors. Then he returns back to the floor and tells his team that it is a murder.

How in heaven did he deduce that?