Which number should replace the question mark?

What has one eye, but can’t see?

Here is a mathematical challenge that will not only engage your brain but also measure your quick-thinking abilities. If you can successfully identify the missing number in such a short span, you are demonstrating exceptional intellectual qualities.

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?

Can you arrange the six given marbles in a manner that each one of them is touching all four marbles of different colours?

I travel all around the world but always stay in the corner. What am I?

Find the Goldfish below the given Image.

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

What month of the year has 28 days?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.