railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Time and Work

To complete a task Danish is 25% more efficient than Dolly. If together they take 20 days to complete the work. In how many days Danish will complete this task alone? 

1
36 days
2
30 days
3
27 days
4
18 days
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