A rigid tank of volume 50 m³ contains a pure substance as a saturated liquid vapour mixture at 400 kPa. Of the total mass of the mixture, 20% mass is liquid and 80% mass is vapour. Properties at 400 kPa are: 𝑻_𝒔𝒂𝒕 = 143.61 °C, 𝒗_𝒇 = 0.001084 m³ /kg, 𝒗𝒈 = 0.46242 m³/kg. The total mass of liquid vapour mixture in the tank is ___________kg (round off to the nearest integer).