There are: 16*20 = 320 square feet
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2.22 square feet.
16
Well, darling, a 16 x 20 room would have a total of 320 square feet. It's as simple as multiplying the length (16 feet) by the width (20 feet). So, go ahead and start measuring those walls if you want to double-check my math.
20 x 20 = 400 square feet.
2.78 square feet.