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?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?

Find the next number in the series below

21 32 54 87 131 ?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Find the value of "?" in the ball picture Riddle below:

What always comes into a house through the keyhole?