One-third of the dairy cattle on a farm are in the barn. three-fifths of the beef cattle are in the barn. there are 30 dairy cattle and 15 beef cattle in the barn. how many more dairy cattle are on the farm than beef cattle?

At the beginning of a call to the cable company, a message tells customers, "after you finish talking to our customer service representative, you will be asked to take a five-question survey about the level of service you recieved. it would be appreciated if you could stay on the line to answer the survey questions." what type of sampling is the cable company using?