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

15 16 18 25

16

Tanya is 25% more efficient than sakshi therefore, efficiency of Tanya is 1.25 Total days required for Tanya to complete work alone = \(\frac{20 }{1.25 }\) = 16