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?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Can you name some countries which do not have the alphabet 'A' in them?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Can you Find and name the hidden bird in the picture below ?

Can you solve the below tricky visual equation?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

A man always keeps a spare tyre in his car. To make full use of all the five tyres, he changes the tyres in a manner that for a distance of 1, 00,000 km, each of them runs the same distance.

Can you calculate the distance travelled by each tyre on that journey?