There is no sensible answer to this question. A foot by foot by inches is a measure of volume, with dimensions [L3]. A yard is a measure of length, with dimensions [L]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions without additional information.
If the questions asked about cubic yards, the answer is:
28' * 28' * 6" = 28/3 yd * 28/3 yds * 6/(12/3) yds
= 9.33... * 9.33... * 0.166... = 14.52 cubic yards.
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9 yards 12 inches = 28 feet
In 28 feet there are 9.3333333333333333..... yards.
There are 36 inches in one yard. Therefore, 28 inches is equal to 28/36 = 0.7 recurring (that is, 0.7777...) yards.
105 ft * 84 ft * 3 inches = 105/3 yards * 84/3 yards * 3/36 yards = 35 * 28 / 12 cubic yards = 245 cubic yards.
28 yards.