What is next number in the pattern below:

131 517 192 123 ?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

Which Travels Faster? Solve below famous picture riddle:

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

What question can you never answer yes to?

Look at the picture and find out which square is not linked with any of the other squares.

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?