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Railways PYQCBT 1 2016

RRB NTPC · Question 88

A cleaning company employs 42 sweepers to clean a building in 25 days. 10 days later, 12 sweepers left the job. If the cleaning work is to be finished in 10 days, how many more cleaning workers need to be hired? A. 30 B. 32 C. 33 D. 21

  1. C

  2. D

  3. A

  4. B

Show answer & explanation

Answer: (A) C

Explanation

Total work = 42 × 25 = 1050 worker-days. In 10 days 420 is done, leaving 630, which must be done in 10 days by 63 workers. With 42 − 12 = 30 remaining, 33 more are needed.