Multiple choice

15 persons can complete a piece of work in 60 days. If the number of persons is increased by 5, then how many days will it take to complete the same work?

  1. 20 days

  2. 10 days

  3. 15 days

  4. 45 days

  5. NA
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Work = 15 * 60 = 900 man-days. New number of persons = 15 + 5 = 20. Days = 900 / 20 = 45 days.

AI explanation

Using the constant work formula (Men1 times Days1 equals Men2 times Days2), the total work equals 15 persons times 60 days, which is 900 person-days. When the number of persons is increased by 5, the new workforce becomes 20 persons. Dividing the total work of 900 person-days by 20 persons yields 45 days.

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