One, example 5'2" equals five feet and two inches.
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"Feet" has no apostrophes.
Inches is shown by two apostrophes (").
The symbol for feet is one apostrophe, as in 15 feet = 15' The symbol for inches is two apostrophes, as in 15 inches = 15"
Plurals don't use apostrophes, so the first one is correct.
Two thirds of a yard is exactly two feet. One third of a yard is one foot; there are three feet to a yard.