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A crawl space should have 900 square centimeters of ventilation for each 27 square meters of...

A crawl space should have 900 square centimeters of ventilation for each 27 square meters of ceiling area, plus 1800 square centimeters for each 30 meters of perimeter around the crawl space. How many square centimeters of ventilation are needed for a 10-meter × 15-meter crawl space?

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