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:	Choose the correct answer.
A) 14
B) 15
C) 16
D) 18
E) 19
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)/5   x = 16 days.   Hence, Tanya takes 16 days to complete the work.   ANSWER:16
<result>C</result>
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: