We have a 'fifty-fifty' chance of succeeding. [=we are as likely to succeed as we are to fail]
The bill for dinner came to $43, and she gave him a 'fifty'.
They divided/split the expenses 'fifty-fifty'. [='equally']
(..) (BAND PLAYING DRAMATIC CLASSICAL MUSIC) I don't really get that shirt. HAZEL: Mmm. But Van Houten will get it. There are, like, fifty Magritte references in An Imperial Affliction. "This is not a pipe." But it is a pipe. But it's not. It is a drawing of a pipe. (..)2014 The Fault in Our Stars