The dewey decimal system groups books by author title length subject

the dewey decimal system groups books by subject.

published in 1876, the dewey decimal system was developed by melvil dewey whose main goal is to organize knowledge in catalogs and classifications. it can be accessed n over a hundred libraries. nowadays, it is the most used system for classification in the world (oclc.org).

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

a, overstatement is the answer