Multiple choice

Sajan is able to do a work in 35 days. Calculate the number of days taken by Tanvir to do the same work, if she is 40% more efficient.

  1. 10 days

  2. 15 days

  3. 25 days

  4. 29 days

  5. Na
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If Tanvir is 40% more efficient than Sajan, her efficiency ratio is 1.4 times Sajan's. Since time taken is inversely proportional to efficiency, Tanvir takes 35 / 1.4 = 25 days.

AI explanation

Using the efficiency formula, Time is inversely proportional to efficiency. Since Tanvir is 40 percent more efficient, her efficiency ratio compared to Sajan is 140 to 100, making their time ratio 100 to 140. Dividing Sajan's 35 days by 1.4 yields the time taken by Tanvir, which is 25 days.

Keep practicing — related questions