fifty-fifty
adjective, adverb
uk/ˌfɪftiˈfɪfti/ usdivided equally between two people, organizations, or groups:
fifty-fifty partners/partnership The board offered a merger on a fifty-fifty partnership basis.
The sex ratio within the organization is around fifty-fifty.
split/divide/share sth fifty-fifty Oil revenues, he noted, were currently split fifty-fifty between the north and the south.
divided equally between two possibilities:
This business has only a fifty-fifty chance of surviving.