It is not possible to answer this question.
There is no such measure as a "pund".
The mass of the pail depends on what material it is made of.
The mass of its contents - if it has any - depends on the substance in the pail. A pail full of water will have much less mass than one full of earth (dirt).
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Fill the 3 gal pail and pour into the 5 gal pail. Refill the 3 gal pail and pour two gallons of it into the 5 gallon pail - filling the 5 gallon pail and leaving 1 gallon in the 3 gallon pail. Dump out the 5 gallon pail and pour the remaining 1 gallon from the 3 gallon pail into the 5 gallon pail. Fill the 3 gallon pail one more time and pour that into the 5 gallon pail with the 1 gallon already in it and you have 4 gallons.
1 pound
1 gal = 4qts.
1 gal equals 4 qts 20/4=5 gal
8 pt = 1 gal ⇒ 40 pt = 40 ÷ 8 gal = 5 gal