If eleven plus two equals one, what does nine plus five equal?

Can you replace the question mark with the correct number?

Can you move 2 matchsticks to form four equal sized squares.

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Solve the following series:
AZ, GT, MN, __, YB

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.

I make two people out of one. What am I?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

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

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?