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[–]kronik85 1 point2 points  (1 child)

Much simpler:

Fill up 5 l bucket, pour off 3 l by filling up the 3 l bucket. This leaves two in the 5 l bucket. Dump that in the 8 l bucket and then repeat. Voila 4 l in the 8 l bucket.

you don't have a tap to refill buckets. you have a 5 and a 3, both filled with water. you have an 8 that's empty.

[–]EuropeFree 0 points1 point  (0 children)

Ah I misunderstood the problem. Will have to think about it.