Multiple choice

If $20$ persons can do a piece of work in $7$ days, then the number of persons required to complete the work in $28$ days.

  1. $4$
  2. $5$
  3. $14$
  4. $10$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is an inverse proportion problem. 20 persons * 7 days = x persons * 28 days. x = (20 * 7) / 28 = 140 / 28 = 5.

AI explanation

Using the constant work formula of men times days, the total work is 20 persons multiplied by 7 days, equaling 140 person-days. To find the number of persons needed to complete this work in 28 days, divide the total work by the required days, giving 140 divided by 28. This calculation results in exactly 5 persons.

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