Multiple choice

An NGO has 2 different blocks. People in block A can complete a work in 25 days, whereas people in block B are 25% more efficient than people in block A. In how many days can people in block B complete the same work?

  1. 35 days

  2. 30 days

  3. 25 days

  4. 20 days

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Efficiency of B = 1.25 * Efficiency of A. Time taken is inversely proportional to efficiency. Time B = Time A / 1.25 = 25 / 1.25 = 20 days.

AI explanation

Using the efficiency formula, Time is inversely proportional to efficiency when the amount of work is constant. Since block B is 25 percent more efficient, their efficiency ratio is 125 to 100, making their time ratio 100 to 125. Dividing Block A's 25 days by 1.25 yields the time taken by Block B, which is 20 days.

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