Can you find the key in the picture below?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

How many letters are in the alphabet?

There are two insects on a tile. Insect X is sitting on one side of the tile (point A) and Insect Y is sitting opposite on the other side of the tile (point B). Now both of them decide to change their position and thus X starts crawling to point B and Y starts crawling to point A. When they meet and pass each other in between, X takes 20 seconds to reach B and Y takes just 5 seconds to reach A.

Can you calculate the total time each of the insects took to change their positions?

Can you count the number of lines in the below picture?

Can you write down eight eights so that they add up to one thousand?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

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

What type of tree can I carry in my hand?