At the bank drive-through canopy, during the material-order review, a isolated mat footing is 51 ft by 10 ft by 4 in. Including 3% waste, how many cubic yards of concrete are needed?
Correct Answer
D) 6.5 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 A: 6.3 CY
6.3 CY is below the supported result for canopy column mat; it likely uses the wrong base, period, or account bucket.
Option B: 75.6 CY
75.6 CY is above the supported result for canopy column mat; it likely adds an unsupported amount or compares the wrong financial base.
Option C: 7.3 CY
7.3 CY is above the supported result for canopy column mat; it likely adds an unsupported amount or compares the wrong financial base.
Memory Technique
Canopy Column Mat drawer for Superintendent Validates: label convert before counting dollars.
Reference Hint
Open-book path: tab Principles and Practices of Commercial Construction, 10th Edition to Concrete foundations; mat footing quantity; verify the construction method, material quantity, equipment use, unit conversion, or field-control calculation.
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