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Railways PYQCBT 1 2016

RRB NTPC · Question 69

The average age of a batch of 19 members is 24 years. If the age of the one faculty is included, then the average increases by 4 months. What is the age of the faculty? A. 35 years B. 30 years 8 months C. 37 years 4 months D. 32 years 8 months

  1. C

  2. A

  3. D

  4. B

Show answer & explanation

Answer: (D) B

Explanation

Total age of 19 members = 19 × 24 = 456 years. With the faculty the average is 24 years 4 months = 24⅓ years for 20 people, a total of 486⅔. The faculty's age = 486⅔ − 456 = 30⅔ years = 30 years 8 months.