Twelve square concrete columns are each 18 in. by 18 in. and 12 ft tall. Ignoring waste, how much concrete is required?
Correct Answer
D) 12.0 cy
One column contains 1.5 x 1.5 x 12 = 27 cf. Twelve columns contain 324 cf, and 324/27 = 12.0 cy. Other choices: 9.0 cy uses a 15 in. side, 10.5 cy rounds down incorrectly, and 13.5 cy adds waste not requested.
Why This Is the Correct Answer
One column contains 1.5 x 1.5 x 12 = 27 cf. Twelve columns contain 324 cf, and 324/27 = 12.0 cy. Other choices: 9.0 cy uses a 15 in. side, 10.5 cy rounds down incorrectly, and 13.5 cy adds waste not requested.
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