5. The water in the tank is pressurized by air, and the pressure is measured by a multi-

fluid manometer as shown in Figure 2. Determine the gage pressure of air in the tank

if h₁ = 0.25 m, h₂ = 0.35 m, and h3 = 0.5 m. The densities of water, oil and mercury

are 1000 kg/m³, 850 kg/m³ and 13600 kg/m³, respectively.