If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

What does this rebus riddle mean?

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

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

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

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

Prove that twice of ten is the same as twice of eleven.