Find out the missing number in the picture attached:

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?

Can you replace the question mark with the correct number in the below table sequence?

Count the number of triangles in the given picture.

What is common among 11, 69, and 88?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Why do people go to bed?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?