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']
(..) A truck? Dad, please tell me you didn't spend our money on this. Oh, no, don't worry, he didn't. He spent my money. A hundred and fifty bucks of it. As an advance on your regular paycheck. - What regular paycheck? - Which you will get back. - When? (..)2014 Transformers: Age of Extinction