24 workers working 7 hours a day produce 4000 units in 30 days. In how many days 30 workers working 8 hours a day will produce 3500 units?

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24 workers working 7 hours a day produce 4000 units in 30 days. In how many days 30 workers working 8 hours a day will produce 3500 units? Answer: 21 days

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.