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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.17
D.14
Answer and Feedback
Answer:B
Feedback:The ratio of their efficiency, i.e. Sakshi : Tannya = 100 : 125 = 4 : 5
Therefore, ratio of time taken by them = 5 : 4
That is, No. of days taken by Sakshi is 5 units of ratio = 20 days
So, 1 unit of ratio = 20/5 = 4 days
Therefore, No. of days taken by Tannya = 4 × 4 = 16 days.

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