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Railways PYQCBT 1 2016

RRB NTPC · Question 16

10 persons can do a job in X days. If 20 persons with twice the efficiency can do the same job in 5 days, then find the value of X? A. 40 B. 15 C. 20 D. 30

  1. B

  2. C

  3. A

  4. D

Show answer & explanation

Answer: (B) C

Explanation

20 people with twice the efficiency equal 40 normal people, who finish in 5 days: 40 × 5 = 200 person-days. So 10 normal people need 200/10 = 20 days, i.e. X = 20.