Only 'fifteen' (of them) showed up on time.
Their boat finished 'fifteenth'.
one 'fifteenth' of the total
(..) when the right time comes. What do you mean by "when the right time comes"? Well, there's also Mom to think about. I was fifteen when I left home. I don't know what freak relationship you have with your mother. But if you can't leave home in your mid-forties then there's something (..)2015 Virgin Mountain