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The best way to approach this problem is to make all of these units consistent. Since you want your result to be in cubic yards, let's make all the linear dimensions yards as well. So since 1 yard = 3 feet = 36 inches, you have 60 ft/3 = 20 yards by 80 ft/3 = 26.667 (approx) yards by 5 in/36 = .13889 (approx) yards. Now multiply your constants together: 20 * 26.667 * .13889 = approximately 74 cubic yards of concrete.

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Q: How many cubic yards of concrete are needed to pour a slab 60 feet by 80 feet by 5 inches thick?
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