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A rectangular continuous footing is 420 ft long, 30 in wide and 12 in deep. With a stated 5% estimating allowance, what concrete volume results to the nearest 0.1 cy?

Correct Answer

B) 40.8 cy

Convert width and depth to feet: 30/12 = 2.5 ft and 12/12 = 1 ft. Estimate = 420 × 2.5 × 1 ÷ 27 × 1.05 = 40.8333… cy, or 40.8 cy to the nearest tenth. Do not round intermediate volumes.

Answer Options
A
38.9 cy
B
40.8 cy
C
42.0 cy
D
48.6 cy

Why This Is the Correct Answer

Convert width and depth to feet: 30/12 = 2.5 ft and 12/12 = 1 ft. Estimate = 420 × 2.5 × 1 ÷ 27 × 1.05 = 40.8333… cy, or 40.8 cy to the nearest tenth. Do not round intermediate volumes.

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