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

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21 binders can bind 1400 books in 15 days. How many binders will required to bind 800 books in 20 days? Answer: 9

Question context

This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.