• A civil engineer requires 2500, 2600 and 3000 cubic metres of sand, fine gravel and coarse gravel respectively on a dam project. There are three pits from which these materials can be obtained. The composition of these pits has been assessed as follows: Sand Fine Gravel Coarse Gravel PIT % % % Pit 1 20 50 30 Pit 2 25 20 55 Pit 3 52 30 18 How many cubic metres must be hauled from each pit in order to meet the project requirements? Use the Gauss Seidel Method. You are required to state whether the leading diagonal is dominant.