It is 31 inches because 1 ft. is 12 inches so 2 ft. is 24 inches then add 7 inches. It is pretty obvious,no offense.
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31 inches = how many feet and inches 2 feet and 7 inches
First you change it into a fraction 2 feet 7 inches = 2 7/12 feet Then you can divide by the 12 (there are 12 inches in a foot) 2 7/12 = 2.583 feet 2 feet 7 inches = 2.583 feet
7 feet 9 inches - 2 feet 11 inches = 4 feet 10 inches.
2 yards, 2 feet, 7 inches 2 yards, 2 feet, 7 inches
There are 12 inches in one foot. Therefore, 7 feet 2 inches is equal to 7 x 12 + 2 = 86 inches.