A rectangular patio slab measures 20 feet by 24 feet and is uniformly 4 inches thick. What net concrete volume is needed, rounded to the nearest hundredth of a cubic yard before waste?
Correct Answer
D) 5.93 cubic yards.
Keep the thickness exact: 4/12 = 1/3 foot. Volume = 20 × 24 × 1/3 = 160 cubic feet; 160 ÷ 27 = 5.925925… cubic yards, rounding to 5.93. Rounding the thickness early produces the incorrect 5.92.
Why This Is the Correct Answer
Keep the thickness exact: 4/12 = 1/3 foot. Volume = 20 × 24 × 1/3 = 160 cubic feet; 160 ÷ 27 = 5.925925… cubic yards, rounding to 5.93. Rounding the thickness early produces the incorrect 5.92.
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