How many 50 lb. bags equal a ton?

It depends on what is in the bag. 1 US Gallon of water = approx. 8.35 lb, so a 50 pound bag would hold about 5.9 gallons of water. A gallon of gasoline weighs about 6.073 pounds per US Gallon, so a 50 pound bag would hold about 8.2 gallons.