If a job requires 80 man-hours and five workers are available, working an eight-hour day, how many days will it take?

• A. 1 day
• B. 3 days
• C. 4 days
• D. 2 days

Answer: (D)

Workload is measured in man-hours, and daily capacity depends on how many workers and how many hours they work. With five workers each putting in eight hours in a day, the team can produce forty man-hours per day. The job requires eighty man-hours in total, so you divide eighty by forty to find the days needed: two days. If any factor changed—more workers or longer daily hours—you’d reduce the days; fewer workers or shorter hours would increase the days.