For every 12 monkeys that a zoo keeps it must hire three zookeepers if a zoo is rehabilitating 228 monkeys, how many zookeepers does the zoo need?
If a zoo is rehabilitating 228 monkeys and the zoo must hire three zookeepers for every 12 monkeys, then the number of groups of 12 monkeys is 228/12 = <<228/12=19>>19 groups.
Since the zookeepers will be hired for every group of 12 monkeys, the zoo must hire 19 groups * 3 zookeepers/group = <<19*3=57>>57 zookeepers. Answer: \boxed{57}.