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15 workers can build a wall in 20 days. Working at the same rate, how many days will 25 workers take to build the same wall?

Competition practiceTime & Work / Pipes
  • A12
  • B14
  • C10
  • D15

Step-by-Step Solution

Total work = worker-days; with 25 workers, time = 300 / 25 = 12 days.
Answer: A) 12

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