10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Count the number of triangles in the given picture.

Through your logical capabilities, can you make 7 an even?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?