There is no sensible answer to this question. A gallon is a measure of volume, with dimensions [L3]. A pound is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
A gallon of air will have a much smaller mass than a gallon of mud.
About 25 pounds for three US gallons of water.
about 5
42 gallons of water is 350.7 pounds
10 US gallons is approximately 83.5 pounds
30 pounds of water is 3.593 gallons.
10 gallons of water is 83.5 pounds
That depends on what substance you have 227.5 pounds of.227.5 pounds of air fills many, many gallons.227.5 pounds of water fills about 27.2 gallons.227.5 pounds of granite fills only a few gallons.
4o pounds
20 gallons of water weighs 167 pounds.
417.5 pounds for 50 US gallons.
About 334 pounds for 40 US gallons.
18 gallons of water is 150.3 pounds.