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?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

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

Do you know what I am?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

What goes up but never comes down?

A father's child, a mother's child, yet no one's son.

Who am I?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

What is full of holes but still holds water?