To convert inches to feet, you divide by 12. If you want the result as a fraction of 3 feet, you divide the result by 3.
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You cannot. 18 is a pure number which has no length and so cannot be converted into a measure of length.
There are 12 inches in one foot. Therefore, 18 feet is equal to 18 x 12 = 216 inches.
12 inches = 1 foot so 18 inches = 18/12 = 1.5 feet and so 10000*18 inches = 10000*1.5 feet = 15000 feet.
18 inches = 1.5 feet, so 18 inches : 10 feet = 1.5 feet : 10 feet = 3 : 20
18 feet 10 inches.