15 persons can complete a work in 60 days. If the number of persons is increased by 5, how many days earlier will the work get completed?

Show answer & explanation

Answer: (C) 15 days

Explanation

The work = 15 × 60 = 900 person-days. With 20 persons it takes 900/20 = 45 days, i.e. 15 days earlier.