Replace the question mark with the correct number in the below-given picture?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

I look at you, you look at me, I raise my right, you raise your left. What am I?

It is always ahead of me yet I can never see it. What is it?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

Count the number of squares in the picture below.

Keyboard words are not in alphabetical order, Why?