If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

A man dies of old age on his 25 birthday. How is this possible?

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

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

How many triangles are there in the picture below?

Can you decipher the below rebus?

PBLUESAISNUERSES

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?