What is next number in the pattern below:

131 517 192 123 ?

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 and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

Using Only Five 5's and any mathematical operator make sum as 37

People make me, save me, change me, raise me. What am I?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Can you find the 09 errors in the picture below?

Find the hidden panda in the image below.

Why is the Hole below a Lock?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?