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Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

Question: Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.
[A].

4

[B].

96

[C].

20

[D].

40

Answer: Option C

Explanation:

No answer description available for this question.