How many water closets are required for a dormitory that houses 200 girls?

In determining the number of water closets required for a dormitory that accommodates 200 girls, one must refer to plumbing codes and standards that dictate the minimum fixture requirements based on occupancy types. Typically, regulations outline that for each female occupant, a certain number of water closets must be provided.

For example, many codes specify that for every 25 female occupants, one water closet is required. Since there are 200 girls in the dormitory, calculating the number of required water closets involves dividing 200 by 25, which yields 8. This number must then be adjusted based on additional factors, such as the need for accessibility or at busy times of day, which could necessitate more fixtures to avoid long wait times.

Therefore, it is common practice or code to round this number up or provide additional fixtures to ensure adequate facilities are available. In this specific scenario, the provision of 20 water closets is likely reached by considering aspects such as usage patterns, allowing for peak demand, and ensuring sufficient access. Thus, selecting 20 as the answer reflects a prudent approach to meeting the needs of the resident population adequately.