50-50 indicates either an equal chance of winning or getting the correct answer, or of an equal ownership of a business or division of a business's profits.
How It's Used
"But the deal could have been structured differently. The IGO suggests a 50-50 revenue split over a 20-year term would have generated enough cash to cover the city's budget needs while giving the city more control. (The report also says the deal could have been adjusted so parking rates went up less, but it's pretty clear they were going to go up.)"
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