![Ringelmann chart No. 2 corresponds to __________ percent black smoke.](https://www.gkseries.com/blog/wp-content/uploads/2021/12/Ringelmann-chart-No.-2-corresponds-to-__________-percent-black-smoke.png)
Q. Ringelmann chart No. 2 corresponds to __________ percent black smoke.
- 10
- 20
- 40
- 80
Answer: Option 3
Answer: Option 3
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