Give the step-by-step reasoning process and then the final answer. Cooper is building a brick fence around all four sides of his property. Each of the four walls of his fence is 20 bricks long, 5 bricks high, and 2 bricks deep. How many bricks does Cooper need to complete his fence?
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A single layer of each wall requires 5 rows * 20 bricks per row = 100 bricks. As each wall has a thickness of 2 bricks, he will need 100 bricks * 2 = 200 bricks per wall. If the complete fence contains four walls, he will require a total of 200 * 4 = 800 bricks.
The final answer: 800.
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