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. 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.
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