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']
(..) There was a better position. This faint scrape where he dragged the tripod and... set it up... Here. Six hundred yards... Six hundred and fifty.. And not to mention the seven or eight mile an hour wind. He would've needed a wind guage. Which he placed here. And put a cigarette down here. (..)2011 Sherlock Holmes: A Game of Shadows