Sakshi can do a piece of work in 15 days.Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work : Choose the correct choice:
A) 15  B) 16  C) 18  D) 12  E) 10
Solution   Ratio of times taken by Sakshi and Tanya = 125 : 100 = 5 : 4 .   Suppose Tanya taken x days to do the work.   5 : 4 : : 15 : x ⇒ x = (15x4/5) ⇒ x = 12 days.   Hence,Tanya takes 16 days is complete the work.   Answer 12
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Sakshi can do a piece of work in 15 days.Tanya is 25% more efficient than Sakshi. The number of days taken by Tanya to do the same piece of work :