A solid concrete porch consists of 3 steps and a landing. The steps have a tread of 11 inches, a rise of 7 inches, and a length of 7 feet; the landing is 6 feet by 7 feet. How much material was used in its construction? 120.46 cu. ft O 116.72 cu. ft 98.00 cu. ft 142.92 cu. ft

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