A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

A sundial has the fewest moving parts of any timepiece. Which has the most?

What is the end of everything?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?