Multiple choice

A work could be completed in 72 days by some workers. However, due to the absence of 9 workers, it was completed in 80 days. The original number of workers was?

  1. 80

  2. 90

  3. 120

  4. 110

  5. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let W = original workers. Total work = 72W worker-days. With (W-9) workers: (W-9) × 80 = 72W. 80W - 720 = 72W. 8W = 720. W = 90. Original workers = 90. Answer B is correct.