Why do you find that most of the buildings are deprived of the 13th floor?

I have branches, but no fruit, trunk or leaves. What am I?

Replace the question mark with the number below given a simple math problem.

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

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?

Can you divide the below-given shape into four equal and identical pieces?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

What can you deduce from the following BrainBat?

CRY
LMKI

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?