Percentage of the oxygen contained in the inhaled air is-----

Options :
  1. 51%
  2. 20%
  3. 21%
  4. 30%

Answer and Explanation :-

Answer: Option 3


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In youth, it was a way I had,To do my best to please.And change, with every passing ladTo suit his theories.But now I know the things I knowAnd do the things I do,And if you do not like me so,To hell, my love, with you.
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