There are forty elephants and they have forty-fore heads. How can this be possible?

What is the fastest way to double your money?

What has lots of eyes, but can’t see?

Name a key which is hardest to turn.

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

1. How can we put an elephant in the refrigerator?
2. How can we put a Giraffe in a refrigerator?
3. The king of the jungle invites all the animals to a party everyone comes except for one animal, which animal?
4. You come to a crocodile-infested lake, you can't go around it, you can't co under it and you can't go over it, how do you get across?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

What has no start, end, or centre?

Why is 6 afraid of 7?

By what process could you make a 'Tea-Table' into food?