what's the probability of getting a king or a queen from a pack of 52 cards?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

What does below chemistry rebus means?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?