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 one
A) 15
B) 16
C) 18
D) 25
E) None of these
EXPLANATION   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 =&gt; x =(4x20/5)   x = 16 days.   Hence, Tanya takes 16 days to complete the work.   Answer 16
<result>B</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: