You are standing next to a well, and you have two jugs. One jug has a content of 3 liters and the other one has a content of 5 liters. How can you get just 4 liters of water using only these two jugs?

One Answer on this Question

1. Lets call the 5 litre jug as jug A and 3 litre jug as jug B. Now, follow the steps:

   Fill jug A completely. Now it contains 5 litres.
   Slowly pour the water from jug A to jug B until jug B is completely filled. Now, jug A contains 2 litres and jug B contains 3 litres.
   Throw away the water in jug B so that it is completely empty. Now, jug A contains 2 litres and jug B is empty.
   Transfer the water from jug A to jug B. Now, jug A is empty and jug B contains 2 litres.
   Fill jug A completely. Now, jug A contains 5 litres and jug B contains 2 litres.
   Transfer water from jug A to jug B until jug B is completely filled. Now, jug A contains 4 litres and jug B contains 3 litres.

   Now you have 4 litres of water in jug A.

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