Before Mount Everest was discovered, what was the highest mountain in the world?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

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

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

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?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

How far can you walk into the woods?

Find the hidden panda in the image below.

Who is that with a neck and no head, two arms and no hands? What is it?