If 9 persons can do a job in 18 days, then 18 persons with twice the efficiency can do the same job in:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. days.
9 persons can do a job in 18 days
Total work = Total person × total time = 9 × 18 = 172
So,18 persons with twice the efficiency can do the same job in:
172/(18 × 2)
= 9/2 days