A retaining wall is 112 ft long, 10 ft high, and 10 in thick. Including 6% waste, how many cubic yards of concrete should be carried?
Correct Answer
A) 36.6 cy
Convert thickness to feet, compute volume, convert to cubic yards, and add waste.
Why This Is the Correct Answer
Convert thickness to feet, compute volume, convert to cubic yards, and add waste.
Why the Other Options Are Wrong
Option B: 34.6 cy
34.6 cy is below the supported result for concrete wall volume; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 39.1 cy
39.1 cy is above the supported result for concrete wall volume; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 43.5 cy
43.5 cy is above the supported result for concrete wall volume; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Concrete Wall Volume cart for Estimator Prices: convert first, thickness second, whole cy last.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 11th Edition, 2024 to Estimating and quantity takeoff; concrete wall volume; verify the quantity, approval point, notice rule, or field record before answering.
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