Correct Answer - Option 1 : 36 days
Given:
Danish and Dolly can complete the work = 20 days
Danish is 25% more efficient than Dolly.
Calculation:
Danish ∶ Dolly
Efficiency 125 ∶ 100
5 ∶ 4
Time 4 ∶ 5
Work completed in days = 20
⇒ Units work done in day = 4+5 =9 units
⇒ Total work done in 20 days = 20 × 9 = 180 units
⇒ Time taken by Danish = 180/5 = 36 days
∴ Danish will complete this task alone for 36 days.
The correct option is 1 i.e. 36 days.
