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Complete the missing letters of the given word.

What has to be broken before you can use it?

How many sides does a circle have?

How many times can you subtract the number 5 from 25?

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?

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

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I have an eye but still cannot see.

Who am I?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.