in order to find how much food would the zookeeper need ever day to feed 6 adult gorillas . you need to find how much food dose one gorilla needs to do that you must divide 160 by 4 and you will get 40.That means that it takes 40lb of food for one gorilla. So now you multiply 40 by 6 to find out how much food 6 gorillas need. So the amount of food that zookeeper need ever day to feed 6 adult gorillas is 240lb