Multiple choice

If $20$ people can build a wall in $7$ days, then the number of persons required to complete the work in $35$ days is:

  1. $4$
  2. $8$
  3. $12$
  4. $20$
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A Correct answer
Explanation

Using the work formula M1*D1 = M2*D2: 20 * 7 = M2 * 35. M2 = 140 / 35 = 4.

AI explanation

Using the Man-Days formula, the total work is 20 people multiplied by 7 days, giving 140 man-days. To find the number of people needed to complete this work in 35 days, divide 140 by 35 to get 4. It requires 4 persons to complete the work.

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