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More Mining Math No. 2
Practice test questions for the PA Mine Officials' Exam

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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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  1. 6,000 CFM
  2. 5,600 CFM
  3. 4,800 CFM
  4. 4,000 CFM