What is the Surname of Barbie Doll?

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

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

Do you know what I am?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

Find the number of squares in the below picture

How is a fly different from a mosquito?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What type of tree can I carry in my hand?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?