A 3-kg plastic tank has a volume capacity of 0.2 m^3 and is filled with water. What is the mass of air that the tank can carry? How many tanks can be filled by helium (SG = 0.138) if the total mass of helium is the same with that of air? How many tanks can be filled with oxygen (SG = 1.1044) if the total mass of oxygen is the same with that of air?
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