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']
(..) - I love you. - I love you too. So far, so good, Chris. - It works. - Thank you very much. Two hundred and fifty dollars. Four more weeks of oxygen. One hundred, , , , , . Twenty, , , . - Anything else? - No, sir. (..)2006 The Pursuit of Happyness