9514 1404 393
Answer:
6 pours
Step-by-step explanation:
Here are two 6-step solutions. The four digits represent the contents of the 9,5,4,2 containers (in that order) after a single pour. The starting condition is 9000.
Solution 1:
- 7002 — 9 > 2
- 7200 — 2 > 5
- 3240 — 9 > 4
- 3510 — 4 > 5
- 3312 — 5 > 2
- 3330 — 2 > 4
Solution 2:
- 5040 — 9 > 4
- 5400 — 4 > 5
- 1440 — 9 > 4
- 1530 — 4 > 5
- 1332 — 5 > 2
- 3330 — 2 > 9
