The answer depends on the units used for 16 and 20. It should be blindingly obvious to anybody that 16 ft x 20 ft and 16 cm x 20 cm, for example, will give very different answers.
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320 square inches
There are 144 square inches in a square foot. This calculates out to be 5,040 square inches.
6 inches on each side. To get square inches of a square you multiply length by width. So, 6 inches by 6 inches = 36 square inches.
16/12=1.3333333 20/12=1.6666666 1.3333333X1.666666=2.2222222 or 16X20/144=2.22222222
There are 144 square inches in one square foot, so there are 17,280 square inches in 120 square feet.