Solution:

PACK MY BOX WITH FIVE DOZEN LIQUOR JUGS.

Solution:

They are matched as shown in the picture below.

Solution:

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

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:

2 minutes (duration between 9:59 and 10:01)

Solution:

The brain teaser can be solved as shown in the image below.

Solution:

This statement is true but only in a specific case i.e. if both of the siblings continue to live till the day the younger is as old as the elder one was during the time of their birth.

Solution:

In the corners of the square, tighten two ropes. Tighten another rope between them by putting rings on each rope. That rope should be tightened on the sheep's neck on the other end.

Solution:

7 Races.

Solution:

16-days

In 15-days, he will climb 15-inch and when he climbs 5 inch more, he will be out of the well :-)

Solution:

2 degree below zero