Twenty workers can finish a piece of work in 30 days. After how many days should 5 workers leave the job to complete the work in 35 days?

Twenty workers can finish a piece of work in 30 days. After how many days should 5 workers leave the job to complete the work in 35 days?

• A. 5 days
• B. 10 days
• C. 15 days
• D. 20 days

 

The correct answer is option C. 15 days. Can you explain this answer in the comments?

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