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Multiple Choice Questions

Shashi can do a piece of work in 20 days Tanya is 25 more efficient than Shashi The number of days t...........

Math and Mental Ability Time and work

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

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Explanation:

Tanya = 125/100 Shashi
Tanya : Shashi
= 5 : 4
Efficiency Ratio of tanya : Shashi
⇒ 5 : 4
Time taken Ratio of tanya : Shashi (Time ∝1/Efficiency)
⇒ 4 : 5
5r → 20 days
1r → 4 days
4r → 16 days
Tanya will do the same work ⇒ 16 days

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