//------------------------------//
// The Answer 22 
// Story: Life is A Test 2: Test Harder (Quite A Bit Harder) 
// by Brony_of_Brody 
//------------------------------//

The fastest method requires seven moves. SisselSanvich details the method below:

"At the start, the 12-liter jug is full and the others are empty. I'll notate this as 12/0/0, to make it easier to track.
Pour from 12 to fill 8. (4/8/0)
Pour from 8 to fill 5. (4/3/5)
Pour all of 5 into 12. (9/3/0)
Pour all of 8 into 5. (9/0/3)
Pour from 12 to fill 8. (1/8/3)
Pour from 8 to fill 5. (1/6/5)
Pour all of 5 into 12. (6/6/0)"