fifty-fifty
1. [ adjective ] equal in degree or extent or amount; or equally matched or balanced
Synonyms: even
Examples:

"even amounts of butter and sugar" "on even terms" "it was a fifty-fifty (or even) split" "had a fifty-fifty (or even) chance" "an even fight"

Related terms: equal
Similar spelling:   fifty-fifth
  fifty-five
  fifty-four