If eleven plus two equals one, what does nine plus five equal?

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

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Can you place three balls such that the equation shown in the picture holds true?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Why Aeroplane windows are round?

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

The Federal bank of London is abducted by the robbers. The head of the robbers asked the cashier to empty their money vault to them and when suddenly cashier got a call from her father. To avoid any suspicion, the robber asked the cashier to pick the call and reply her father in the shortest manner possible.

The cashier told her father "Is there an emergency father, Call me when you are free and I will help you in your furnishing" and then the cashier hung up the phone.

After 10 minutes, police arrived at the crime scene.

How did the police know about the robbery?

What happened when the wheel was invented?