Which number should replace the question mark?

Rearrange the letters in "new door" to make one word.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

What shoe company does this rebus represent?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

If a wheel has 54 spokes, how many spaces are there between the spokes?