A temporary weather-protection scope is estimated at 320 labor-hours and must finish in 5 eight-hour workdays. How many workers are needed?
Correct Answer
A) 8 workers
Available hours per worker are 5 x 8 = 40. Required workers are 320 / 40 = 8. Other choices use too few hours, round without calculation, or add extra crew not supported by the estimate.
Why This Is the Correct Answer
Available hours per worker are 5 x 8 = 40. Required workers are 320 / 40 = 8. Other choices use too few hours, round without calculation, or add extra crew not supported by the estimate.
Why the Other Options Are Wrong
Option B: 6 workers
crew size, choice b: 6 workers backs into 0.75 when divided by 320 / 40; the accepted setup gives 1 on that same base.
Option C: 10 workers
crew size, choice c: 10 workers backs into 1.25 when divided by 320 / 40; the accepted setup gives 1 on that same base.
Option D: 12 workers
crew size, choice d: 12 workers backs into 0.3 when divided by 40; the accepted setup gives 0.2 on that same base.
Memory Technique
Picture a switch labeled crew size: finish every operation before accepting 8 workers.
Reference Hint
Open Construction Jobsite Management, 5th Ed.; use the index entry or section for "Manpower planning" to confirm that Available hours per worker are 5 x 8 = 40.
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