More Mining Math No. 2 Practice test questions for the PA Mine Officials' Exam
Progress Indicator:
Question 1 of 15
1. The quantity of return air was 10,500 CFM and found to contain 2.3% CH4. How much extra air is needed to reduce the methane content to 1.5%?
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Choices:
- 6,000 CFM
- 5,600 CFM
- 4,800 CFM
- 4,000 CFM
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