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A does a work in 90 days, B in 40 days and C in 12 days. They work one day each in turn, A on day 1, B on day 2, C on day 3, repeating. In how many days is the work done?

Competition practiceTime & Work / Pipes
  • A26 days
  • B28 days
  • C30 days
  • D27 days

Step-by-Step Solution

Each 3-day cycle: . 8 cycles (24 days): . Day 25 (A): +4 = 348; day 26 (B): +9 = 357; day 27 (C) finishes.
Answer: D) 27 days

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