for every 12 monkeys that a zoo keeps it must hire 3 zookeepers if a zoo is rehabilitating 228 monkeys how many zookeeper's does the zoo need

To calculate the number of zookeepers the zoo needs, we divide the number of monkeys by the ratio of monkeys to zookeepers.

For every 12 monkeys, the zoo needs to hire 3 zookeepers.

So, if the zoo is rehabilitating 228 monkeys, we divide 228 by 12 to get the number of sets of 12 monkeys: 228/12 = <<228/12=19>>19 sets of 12 monkeys.

And since for every set of 12 monkeys, the zoo needs to hire 3 zookeepers, the total number of zookeepers needed is 19 * 3 = <<19*3=57>>57 zookeepers. Answer: \boxed{57}.