During the material-order review at the retail demising-wall phase, a equipment-support slab is 24 ft by 22 ft by 10 in. Including 7% waste, how many cubic yards of concrete are needed?
Correct Answer
A) 17.4 CY
Convert slab thickness from inches to feet, divide by 27 cubic feet per cubic yard, then add waste.
Why This Is the Correct Answer
Convert slab thickness from inches to feet, divide by 27 cubic feet per cubic yard, then add waste.
Why the Other Options Are Wrong
Option B: 16.3 CY
16.3 CY is below the supported result for generator pad extension; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 195.6 CY
195.6 CY is above the supported result for generator pad extension; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 19.5 CY
19.5 CY is above the supported result for generator pad extension; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Superintendent Validates takeoff: count the condition before counting the package.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Concrete equipment pads; volume and waste; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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