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

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?

What does this simple rebus mean?

Which digit occurred maximum times between the number 1 and 1000?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

A couple went on a climbing trip. But only the husband returned from the vacation and said that his wife slipped off while climbing and died. On investigating, the local sheriff arrested him saying, 'Your travel agent called. You murdered your wife.'

The man did not inform anyone about the trip. Then how was the agent so sure that it was a murder?

What goes up but never comes down?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?