6 feet 8 inches is 80 inches.
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15 feet 6 inches
The difference between 2 feet and 8 inches and 6 feet and 8 inches is -48 inches.
8 feet 6 inches
The sum of 6 feet 10 inches and 8 feet 9 inches is: 15 feet 7 inches.
8 feet, 10 inches