An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Okay before we begin with the puzzle, do keep in mind that you have to answer it quickly.

You are participating in a car race. Seeking the perfect moment, you overtake the second person in the race. What positions are you in now?

If an electric train is travelling south, then which way is the smoke going?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Move four matchsticks to the below square to form three squares?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

Can you find the missing piece of the Porsche?

Can you replace the question mark with the correct number in the below table sequence?