399
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21 feet times 19 feet = 399 square feet
(21 + 21 + 19 + 19)/4 = 20
21+21+19+19=80
1.1053
There are 8 numbers. So you need to find the average of the 4th and 5th numbers when they are placed in order. So, average of 16 and 19 = 17.5