What has to be broken before you can use it?

Can you write down eight eights so that they add up to one thousand?

When 99 is considered higher than 100?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

What is the fastest way to double your money?

What is at the end of a rainbow?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

81 x 9 = 801. What must you do to make the this equation true?

what does this picture(rebus) riddle means ?

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?