A continuous footing is 120 ft long, 24 in. wide, and 12 in. deep. With a 5 percent ordering allowance, what concrete quantity should be carried?
Correct Answer
B) 9.3 cy
The footing volume is 120 x 2 ft x 1 ft = 240 cf; 240/27 = 8.9 cy; adding 5 percent gives 9.3 cy. Other choices: 8.9 cy omits the allowance, 10.7 cy uses a 20 percent allowance, and 6.7 cy uses only 18 in. of width.
Why This Is the Correct Answer
The footing volume is 120 x 2 ft x 1 ft = 240 cf; 240/27 = 8.9 cy; adding 5 percent gives 9.3 cy.
Why the Other Options Are Wrong
Option A: 8.9 cy
footing volume, choice a: the answer choice lifts 8.9 cy from the working line 240/27 = 8.9 cy.
Option C: 10.7 cy
footing volume, choice c: 10.7 cy is wrong because 10.7 cy equals about 288.9 cf after cubic-yard conversion; the accepted cubic-foot volume is 240 cf before dividing by 27 in.
Option D: 6.7 cy
footing volume, choice d: 6.7 cy equals about 180.9 cf after cubic-yard conversion; the accepted cubic-foot volume is 240 cf before dividing by 27 in.
Memory Technique
Say the footing volume rule aloud as a chain; the chain ends at 9.3 cy, not an intermediate stop.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Concrete quantity takeoff - continuous footings" to confirm that The footing volume is 120 x 2 ft x 1 ft = 240 cf; 240/27 = 8.9 cy; adding 5 percent gives 9.3 cy.
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