An open tank has a horizontal bottom. It is divided into two parts by a vertical gate. The gate is rectangular, 3m high and it is hinged at its top. Water of density p,=1000kg/m3 in one part of the tank is acting on one side of the gate, and oil of density p, in the other part of the tank is acting on the other side of the gate. The gate is in equilibrium in vertical position. The water depth is 1.50m and the oil depth is 1.65m. Find the oil density p,.