A temporary protection task uses 5 workers for 8 hours per day over 4 days. How many labor-hours should be recorded?
Correct Answer
C) 160 labor-hours
Labor-hours are 5 workers x 8 hours/day x 4 days = 160 labor-hours. Other choices omit either worker count, daily hours, or one day of work.
Why This Is the Correct Answer
Labor-hours are 5 workers x 8 hours/day x 4 days = 160 labor-hours. Other choices omit either worker count, daily hours, or one day of work.
Why the Other Options Are Wrong
Option A: 40 labor-hours
labor-hours, choice a: 40 labor-hours equals 5 x 8. That multiplies those two listed numbers.
Option B: 80 labor-hours
labor-hours, choice b: 80 labor-hours backs into 10 when divided by 8; the accepted setup gives 20 on that same base.
Option D: 120 labor-hours
labor-hours, choice c: 120 labor-hours backs into 15 when divided by 8; the accepted setup gives 20 on that same base.
Memory Technique
Store labor-hours with its last math move; nearby answers are usually unfinished versions of 160 labor-hours.
Reference Hint
Open Construction Jobsite Management, 5th Ed.; use the index entry or section for "Labor-hour tracking" to confirm that Labor-hours are 5 workers x 8 hours/day x 4 days = 160 labor-hours.
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