X number of men can finish a piece of work in 30 days. If there were 6 men more, the work could be finished in 10 days less. What is the original number of men?

X number of men can finish a piece of work in 30 days. If there were 6 men more, the work could be finished in 10 days less. What is the original number of men?

• A. 10 
  
• B. 11
  
• C. 12 
  
• D. 15 
  

 

The correct answer is option C. 12. Can you explain this answer in the comments?

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