The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

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

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

I am an odd number. Take away a letter and I become even. What number am I?

What makes this number unique: 8,549,176,320?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.