You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

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?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

What has many keys but can’t open a single lock?

What do you see in the given picture?

Which country gets ill every time?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?