If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

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?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

How can you take 2 from 5 and leave 4?

Below rebus represent famous DiCaprio movie. Can you name it?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Why do you find that most of the buildings are deprived of the 13th floor?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Count the number of triangles in the given picture.

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?