What happened when the wheel was invented?

81 x 9 = 801. What must you do to make the this equation true?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

The more of this there is, the less you see. What is it?

What jumps when it walks and sits when it stands?

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?