Neha can do a piece of work in 20 days. Ramya is 25% more efficient than Neha. The number of days taken by Ramya to do the same piece of work is:

15

16

18

21

Ratio of times taken by Neha and Ramya=125:100 = 5 : 4. Suppose Ramya takes x days to do the work. 5 : 4 ::20 : x x = (4×20/5) x = 16 days.

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