In an office, 75 employees can finish a project in 60 days. After a few days, 15 employees left the job and the project was completed in 65 days. After how many days did the 15 employees leave?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 40.
Concept used
Total work = Worker × efficiency
Given that
75 employees can finish a project in 60 days
Let, after D days, 15 employees left the work
According to hte question
⇒ 75 × D + (75 - 15) × (65 - D) = 75 × 60
⇒ 75 D + 60 × 65 - 60 D= 75 × 60
⇒ 15 D = 4500 - 3900 = 600
⇒ D = 600/15 = 40 days