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:
15
16
18
25
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 $ $\Rightarrow x $ =$ \left(\dfrac{4 \times 20}{5} \right) $
$\Rightarrow x $ = 16 days.
Hence, Tanya takes 16 days to complete the work.