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A rectangle area that is 12 feet by 14 feet by 6 inches deep is equal to 3.11 cubic yards. This job would require 4.2 tons of gravel.
144
Volume = 120/12= 10 cubic feet for each 1 inch of depth= 2 bags for each 1 inch of depth.
Assuming the units for the three measures are the same, you need 14400 cubic units.
normally, you first need to calculate surface area of the brick which is 12*12=144. then you need to divide total area to bricks surface area which is 48/144. but probably they gave the units in terms of cm ot metres,then first you need to make them same unit.