If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

The more you take me, the more you leave me behind.
Who Am I?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

I add 5 to 9 and get 2. The answer is correct, so what am I?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

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

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?