Only 'fifteen' (of them) showed up on time.
Their boat finished 'fifteenth'.
one 'fifteenth' of the total
(..) How far is it from Post to the Windward Barracks? Well, it's a ways, sir. It's a hike. About how far by Jeep? About ten or fifteen minutes, sir. You ever had to walk it? Yes, sir. That day, Friday. The pickup private-- That's what we call the guy who drops us off and picks us up... (..)1992 A Few Good Men
(..) a drunk and disorderly. It lasted nine weeks. I rounded up people from the bar that night. Nine weeks on a D and D? What was the prosecutor offering? Fifteen days. You sure hustled the shit out of him. Well, after that they moved me to Internal Affairs. - Tough to blame them. (..)1992 A Few Good Men