A continuous footing is 420 lf long, 30 in wide, and 12 in deep. Including 5% waste, how many cubic yards of concrete should be carried?
Correct Answer
B) 40.8 cy
Convert inches to feet, compute volume, convert to cubic yards, and add waste.
Why This Is the Correct Answer
Convert inches to feet, compute volume, convert to cubic yards, and add waste.
Why the Other Options Are Wrong
Option A: 38.9 cy
38.9 cy is below the supported result for continuous footing concrete; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 42.0 cy
42.0 cy is above the supported result for continuous footing concrete; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 48.6 cy
48.6 cy is above the supported result for continuous footing concrete; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Continuous cart for Prices Shallow: convert first, inches 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 footing volume; confirm the required quantity, authority, timing, or record before selecting the answer.
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