If two's company, and three's a crowd, then whats four and five ?

What do you see in the image below

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?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Can you start the fire using two pieces of wood?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

How many times do a clock's hands overlap in a day ?