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21 binders can bind 1400 books in 15 days. How many binders will be required to bind 800 books in 20 days?

Question: 21 binders can bind 1400 books in 15 days. How many binders will be required to bind 800 books in 20 days?
  • A. 7
  • B. 9 ✓
  • C. 12
  • D. 14
Correct Answer: B. 9
Explanation: Using the work-time relationship, 9 binders are needed for the task.

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