Multiple choice

7 men can complete a piece of work in 12 days. How many additional men will be required to complete double the work in 8 days?

  1. $28$
  2. $12$
  3. $21$
  4. $14$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Work = men × days. Original: 7 × 12 = 84 man-days. New work: 2 × 84 = 168 man-days (double work). Required men = 168/8 = 21 men. Additional men needed = 21 - 7 = 14. Option D is correct.