Mary can do a piece of work in 26 days. Rosy is 30% more efficient than Mary. The number of days taken by Rosy to do the same piece of work is?
Choose the correct option
A) 22  B) 20  C) 24  D) 26  E) 30
Ratio of times taken by Mary and Rosy = 130:100 = 13:10   Suppose Rosy takes x days to do the work.   13:10 :: 26:x =&gt; x= 20 days.   Hence, Rosy takes 20 days to complete the work.   Answer: 20
<result>B</result>
Mary can do a piece of work in 26 days. Rosy is 30% more efficient than Mary. The number of days taken by Rosy to do the same piece of work is?