You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Find out the missing number in the picture attached:

There are 4 big houses. They are made from the materials: red marble, green marble, white marble and blue marble.

* Mrs Jennifer's house is somewhere to the left of the green marble one and the third one alone is white marble.
* Mrs Sharon owns a red marbles house and Mr Cruz does not live at either end, but lives somewhere to the right of the blue marbles house.
* Mr Danny lives in the fourth house, while the first house is not made from red marble.

Who lives where, and what is their house made from?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Solve the rebus riddle in the picture below.

By what process could you make a 'Tea-Table' into food?

What is the probability of choosing the correct answer at random from the options below?

a) 1/4
b) 1/2
c) 1
d) 1/4

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?