Give the step-by-step reasoning process and then the final answer. Mancino is tending 3 gardens that each measure 16 feet by 5 feet. His sister, Marquita, is tilling the soil for two gardens that each measure 8 feet by 4 feet. How many square feet combined are in all their gardens?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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3 * (16 * 5) = 240 square feet. 2 * (8 * 4) = 64 square feet. 240 + 64 = 304 square feet. The gardens have a total of 304 square feet.
The final answer: 304.