Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

What has many keys but can’t open a single lock?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

Vin Diesel is pulling a theft and has planned to run away with all the cash kept in the safe. But the only way to open the safe is the 13 character password. He has a set of five clues given to him by a trustworthy source.

Exactly two of the below statements are false.
The password is contained within this sentence.
The password is not in this hint.
The password is within only one of these statements.
At least one of the above statements is a lie.

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

What is the Surname of Barbie Doll?

What can you deduce from the following BrainBat?

CRY
LMKI

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?