Only 'fifteen' (of them) showed up on time.
Their boat finished 'fifteenth'.
one 'fifteenth' of the total
(..) You like that, Spidey? I like it a lot, Max. Good...because today is going to be amazing. Circuit thirty nine. I'm not late, Harvey, I'll be there in fifteen minutes. I just wanna know if you can find another waitress to replace me because I start my training rounds at the hospital. (..)2014 The Amazing Spider-Man 2