The answer will depend on how wide and deep the grout is applied!
A standard 20kg bag of grout will cover approximately 2.5 square metres - depending on how thick you apply it - these figures are for a 5mm thickness.
tile size 18X36 and 1x2 what is the covverage of a 25# bag of grout
Depends on how big the bag is, and what is in the bag.
one bag
Depends what is the material in bag.
That is approximately 1/2 a cubic foot.
How many pounds of what?
How many Pounds is the bag of Pencil?
A "bag" can be a large variety of sizes, so there is no way to estimate this.
A 25 lb bag of grout typically contains around 0.5 to 0.6 cubic feet of dry material, depending on the specific brand and type of grout. When mixed with water, it usually yields approximately 0.5 to 0.6 cubic feet of finished grout. This amount can vary based on the water-to-grout ratio used during mixing. Always check the manufacturer's specifications for precise measurements.
5 pounds