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:

[A]. 15

[B]. 16

[C]. 18

[D]. 25

✅ The correct answer is option B.
Ratio of times taken by Sakshi and Tanya = 125 : 100 = 5 : 4.
Suppose Tanya takes x days to do the work.

5 : 4 :: 20 : x x =

4 x 20

x = 16 days.
Hence, Tanya takes 16 days to complete the work.

135. 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: