At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

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?

I’m tall when I’m young, and I’m short when I’m old. What am I?

How many Watermelons are there in the below picture?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Solve the following series:
AZ, GT, MN, __, YB

What runs around the whole yard without moving?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

Which number should replace the question mark?