There are approximately 0.67 cubic feet in a 5-gallon pail.
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.
5 gallon
Depends on the pail, many are different sizes.
You first dump the 5-gallon pail, then fill the 5-gallon pail from the water from the 8-gallon pail. Then you dump the 5-gallon pail again, and you are left with 2 gallons in the 8-gallon pail.
42.6 lbs.
44pds
A 5-gallon pail of concrete typically weighs around 100 pounds. This weight can vary depending on the specific type of concrete mix being used.
yes...weigh pail contents on scale and use weight per bushel of volume chart
Need to know the dimensions of the pail in order to answer this. Six inches in a pail with a wide radius and shallow walls will not be the same as six inches in a pail with a smaller radius and taller walls. 5 gallons is only a measurement of the volume capacity.
40 lbs http://www.onlineconversion.com/weight_common.htm
Unknown. Mercury is too dangerous to test.