Gauge pressure measured in tank A is 20 kN/m2 and in tank B is -29 kN/m2. The water surface is at an elevation of 37 m, the oil surface is at an elevation of 40 m, and the oil-manometer liquid interface (point C) is at an elevation of 35 m. The specific gravity of the oil is 0.8, and the specific gravity of the manometer liquid is 1.6. (The density of water can be considered as 1000 kg/m3)
So, determine the elevation of point D.