A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

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?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What does the below mathematical rebus mean?

You need to move three matchsticks to form three squares. Can you do it?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Find the next number in the series.
1 10 24 43 67 ?

Find the missing number in the sequence below:

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?

81 x 9 = 801. What must you do to make the this equation true?