Multiple choice

If 20 men working 8 hours per day can complete a piece of work in 21 days. How many hours per day must 48 men work to complete the same job in 7 days?

  1. 12

  2. 20

  3. 10

  4. 15
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using M1*D1*H1 = M2*D2*H2: 20 * 21 * 8 = 48 * 7 * H2. 3360 = 336 * H2. H2 = 10.

AI explanation

Using the standard workforce formula M1 times D1 times H1 equals M2 times D2 times H2, we equate the total man-hours needed for the job. Substituting the given values gives 20 times 21 times 8 equals 48 times 7 times H2. Solving this equation yields 3360 equals 336 times H2, so H2 equals 10 hours per day.

Keep practicing — related questions