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

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

I have branches, but no fruit, trunk or leaves. What am I?

What is the riddle which can be asked all day with a different correct answer each time.

I always drive my customer away.

Who am I?

There is a basket full of hats. Three are white and two are black. Three men, Tom, Tim, and Jim, each take a hat out of the basket and put it on their heads without seeing the hat they selected or the hats the other men selected. The men arrange themselves so Tom can see Tim and Jim’s hats, Tim can see Jim’s hat, and Jim can’t see anyone’s hat. Tom is asked what color his hat is and he says he doesn’t know. Tim is asked the same question, and he also doesn’t know. Finally, Jim is asked the question, and he does know. What colour is his hat?

The host of a game show offers the guest a choice of three doors. Behind one is an 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?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

What has lots of eyes, but can’t see?

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