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Sagot :
Answer:
4.2 GALLONS
Explanation:
Air is made up of nitrogen, oxygen, argon, carbon dioxide, neon, helium, krypton, hydrogen, and xenon.
the percentage of oxygen in the air is 21%
If a container has 20 gallons of air in it, oxygen in it = 0.21 x 20 = 4.2 gallons
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