During the subcontractor quantity check at the airport rental-car counter, the dock apron slot requires 149 LF of trench drain frame plus 6% waste. Stock comes in 8 ft sections. How many sections are required?
Correct Answer
A) 20 sections
Linear stock count equals required length with waste divided by stock length, rounded up.
Why This Is the Correct Answer
Linear stock count equals required length with waste divided by stock length, rounded up.
Why the Other Options Are Wrong
Option B: 19 sections
19 sections is below the supported result for trench drain frame; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 21 sections
21 sections is above the supported result for trench drain frame; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 22 sections
22 sections is above the supported result for trench drain frame; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Trench Drain Frame cart for Field Engineer: linear first, stock second, whole units last.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Specialty drainage; modular frame sections; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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