Solution:

One for all or all for one.

Solution:

They use the bricks and dirt from the tunnel to stand on it.

Solution:

7, 4, 6, 5, 8

Solution:

They are matched as shown in the picture below.

Solution:

One of the cop will move clockwise while the other will move anti-clockwise every day. In such a manner, they will catch the thief in minimum seven days.

Solution:

He simply suggested that one of the brothers will be allowed to divide the land but he must take into consideration that it will be the other one who will have a choice of selecting his land between the two halves first.

Thus both will be happy in such manner.

Solution:

They used the planks in the manner that is shown in the figure.

Solution:

This is more of a philosophical question than being a riddle or a puzzle. The action of Brian directly led to the result which is the death of Chris. Thus he murdered Chris. In a sense, Chris died due to the lack of water. It is the circumstances that ultimately led to his death.

Solution:

The probability of two numbers being relatively prime is 60%. Thus if you keep playing the bet, you will hypothetically make 20 cents on every play.

Thus, you should accept the bet.

Solution:

There are 3 fruits (1 grapes, 1 apples, and 1 oranges).

Solution:

Sansa has the siamese (conjoined) twin sister.