Question: A mosaic tile floor is designed in the shape of a trapezoid 30 feet wide at the base and 15 feet wide at the top.

A mosaic tile floor is designed in the shape of a trapezoid 30 feet wide at the base and 15 feet wide at the top. The tiles, 12 inches by 12 inches, are to be placed so that each successive row contains one less tile than the row below. How many tiles will be required?

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