The number of square feet that were mowed in the third evening is 36.201 ft².
Amount of lawn moved in the first day
Amount (day 1) = ²/₉ x 108.6 ft²
Amount (day 1) = 24.133 ft²
Amount of lawn moved in the second day
Amount (day 2) = 2(24.133 ft²) = 48.266 ft²
Amount of lawn moved in the third day
Amount (day 3) = 108.6 ft² - (24.133 ft² + 48.266 ft²)
Amount (day 3) = 36.201 ft²
Thus, the number of square feet that were mowed in the third evening is 36.201 ft².
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