Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

What has hands, but can’t clap?

When it's bad luck to meet a black cat?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?