What number comes next in the series?

5 15 5 18 5 24 14 20 _

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

What always comes into a house through the keyhole?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

What has hands, but can’t clap?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

What does the below image rebus riddle means ?