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Shashi can do a 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:
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Explanation:
Let the number of days to complete the work be x.
25% = 25/100
⇒ 25% = 1/4
Let the efficiency of Sakshi be 4x.
The efficiency of Tanya = 4x + 4x × (1/4)
⇒ The efficiency of Tanya = 5x
According to the question,
4/5 = x/20
⇒ x = 16
∴ Tanya will complete the work in 16 days.