The tank is filled with water to a depth of d = 4 m. Determine the resultant force the wat...

The tank is filled with water to a depth of d = 4 m. Determine the resultant force the water exerts on side A and side  of the tank. If oil instead of water is placed in the tank. to what depth d should it reach so that it creates the same resultant forces? ρa = 900 kg/m3 and ρw = 1000 kg/m3.