Final answer:
To separate 8 liters of water from both buckets, the student can take 6 liters from the 2nd bucket and 2 liters from the 1st bucket.
Step-by-step explanation:
To separate 8 liters of water from both buckets, the student can take 6 liters from the 2nd bucket and 2 liters from the 1st bucket. This will leave 4 liters in each bucket.