Question

A barman is having a 12 liters jug full of beer. He needs to divide or split that beer into two equal parts. All he has is two empty jugs of capacity 8 liters and 5 liters.

Answer 1

He fills the *L jug with 8L and puts the remaining 4L in the 5L jug.
(12L = empty; 8L jug = 8L; 5L jug = 4L)
He empties the 8L jug in the 12L jug and pours the content of the 5L jug into the 8L jug.
(12L jug = 8L; 8L jug = 4L; 5L jug = empty).
He fills the 5L jug from the 12L jug and fills up the 8L jug with the 5L jug.
(12L jug = 3L; 8L jug = 8L; 5L jug = 1L)
He empties the 8L jug in the 12L jug and empties the 5L jug int the 8L jug.
(12L jug = 11L; 8L jug =1 L; 5L jug = empty)
He fills the 5L jug from the 12L jug and empties it in the 8L jug, which now contains 6L
(12L jug = 6L; 8L jug = 6L; 5L jug = empty)

Answer 2

STEP 0 1 2 3 4 5 6 7

5-Liter 0 0 5 0 3 3 5 0
8-Liter 0 8 3 3 0 8 6 6
12-Liter 12 4 4 9 9 1 1 6