Multiple choice

If 5 men can do a piece of work in 28 days, then the number of persons required to do the same work in 7 days is

  1. 15

  2. 30

  3. 20

  4. 35
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using the work-man formula M1 * D1 = M2 * D2, we have 5 * 28 = X * 7. Thus, X = (5 * 28) / 7 = 5 * 4 = 20.

AI explanation

Using the formula M1D1 = M2D2, where M represents the number of men and D represents the number of days, we substitute the given values. The equation becomes 5 men multiplied by 28 days equals the unknown number of men multiplied by 7 days. This gives 140 = 7 multiplied by M2. Solving for M2 by dividing 140 by 7 results in 20 persons required.

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