When we see 2 but call 10?

In the picture given below, can you find out which digit will take place of the question mark?

I have an eye but still cannot see.

Who am I?

Solve the mathematical equation in the picture below.

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

If it took eight men ten hours to build a wall, how long would it take four men to build it?