A mass excavation produces 1,180 loose cubic yards of material for off-site disposal. End-dump trucks can haul 18 loose cubic yards per trip. What truck count is required?
Correct Answer
C) 66 trips
Trips required are 1,180/18 = 65.56, so the count must round up to 66 trips. Other choices round down, add a small arbitrary allowance, or use a smaller truck capacity.
Why This Is the Correct Answer
Trips required are 1,180/18 = 65.56, so the count must round up to 66 trips. Other choices round down, add a small arbitrary allowance, or use a smaller truck capacity.
Why the Other Options Are Wrong
Option A: 65 trips
haul count, choice a: 65 trips counts a different spacing, panel, or repeated member quantity.
Option B: 68 trips
haul count, choice c: 68 trips is wrong because 68 trips counts a different spacing, panel, or repeated member quantity.
Option D: 72 trips
haul count, choice d: 72 trips counts a different spacing, panel, or repeated member quantity.
Memory Technique
Say the haul count rule aloud as a chain; the chain ends at 66 trips, not an intermediate stop.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use the index entry or section for "Excavated material hauling calculation" to confirm that Trips required are 1,180/18 = 65.56, so the count must round up to 66 trips.
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