Correct Answer - Option 2 : 3 days
Given:
The person completes 3/4th of the work in 9 days.
Concept Used:
Total work = 1 part
Calculation:
The person completed 3/4th part of the work
⇒ Remaining part of the work is (1 - 3/4) = 1/4th part
3/4th part completed in 9 days
⇒ 1 part will complete in 9 × (4/3) = 12 days
⇒ 1/4th part will complete in 12/4 = 3 days
∴ He will take 3 days to complete the remaining portion of the work.