Vandana can do a piece of work in 25 days. Vasvi is 25% more efficient than Vandana. The number of days taken by Vasvi to do the same piece of work is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 20 Days
For the same piece of work, the time taken is inversely proportional to efficiency: a person who does more work each day needs fewer days.
Vasvi is 25% more efficient, so Vasvi’s efficiency : Vandana’s efficiency \(=125:100=5:4\)
The times taken are in the inverse ratio, Vasvi : Vandana \(=4:5\)
Vasvi’s time \(\displaystyle =25\times\frac{4}{5}=20\) days