If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

The Little ant seems to be always confused. Do you know why?

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

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?