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A "yard of gravel" is a measure of volume, not a measure of area. There are 27 cubic feet (3x3x3 feet) in a yard of gravel, or one cubic yard.
Gravel is bought in cubic quantities, or by weight. You ask "to fill" but you only give a square measure. The volume of gravel required wil depends on the depth you wish the gravel to be. To fill 81 square metres to a depth of 5 cm would require 4.05 cubic metres of material.
When they need an approximate measurement. The scales used to weigh a truckload of gravel are not as accurate as laboratory scales that can measure the weight of a pencil mark on a bit of paper- but extreme accuracy is not needed for the gravel truck.
This depends on the size of gravel, the water content of the gravel, and the material composition of the rock used to make the gravel. Typically 1 cu.yd. of gravel wieghs 3000 lb.
The more gravel you have, the more it weighs.