5L,3L jar puzzle , socs puzzle
Sigiloso
Fill the 5L jar. (5, 0) Pour from 5L into 3L until the 3L is full. (2, 3) Empty the 3L. (2, 0) Pour the 2L from the 5L into the 3L. (0, 2) Fill the 5L jar. (5, 2) Pour from 5L into 3L until the 3L is full (needs 1L). (4, 3) Now the 5L jar has 4 liters.