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Shashi can do piece of work in 20 days. Tanya is 25% more efficient than Sashi. The number of days taken by Tanya to do the same piece of work is = ?

Shashi can do piece of work in 20 days. Tanya is 25% more efficient than Sashi. The number of days taken by Tanya to do the same piece of work is = ? Correct Answer 16

$$\eqalign{ & 25\% = \frac{1}{4}\left \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\text{Sashi }}:{\text{ Tanya}} \cr & {\text{Efficiency}}\,\,\,\,\,\,\,4{\text{ }}:{\text{ }}5 \cr & {\text{Days}}\,\,\,\,\,\,\,\,\,\,\,\mathop {\mathop 5\limits_{{\text{ }} \downarrow \times 4} }\limits_{20} :\mathop {\mathop 4\limits_{{\text{ }} \downarrow \times 4} }\limits_{{\bf{16}}} \cr} $$

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