47. A 4 m³ /hr pump delivers water to a pressure tank. At the start, the gage read 138 kPa until it reads 276 kPa and then the pump was shut off. The volume of the tank is 180 liters. At 276

kPa, the water occupied 2/3 of the tank volume. Determine the volume of the water that can

be taken out until the gage reads 138 kPa.

A. 31.20 liters

B. 34.59 liters

C. 16.87 liters

D. 29.50 liters