Nelson and Jack are both avid sailors. When a sailing acquaintance put his older, but still highly desirable, boat up for sale, Nelson and Jack agreed to pool their resources to buy and fix up the boat, then sell it and split the profits. This is an example of an

taking a bath requires the most water out of the given options because it takes a significant amount of water in order to fill a bathtub.

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.