If a large wash basin for hand washing is 80 inches around, it may be considered as equal to how many lavatories?

To determine the equivalent number of lavatories represented by a large wash basin with a circumference of 80 inches, it's essential to know the standard sizing for a lavatory. Typically, one lavatory is considered to have a minimum of around 15 to 20 inches in size, providing an adequate space for hand washing.

When the circumference of the large wash basin is 80 inches, you can use this measurement to gauge how many standard lavatories it can accommodate. By dividing the total circumference (80 inches) by an approximate circumference size of a standard lavatory (often taken as 20 inches for calculation purposes), you find that the large wash basin could effectively serve about four standard lavatory spaces.

The answer indicates that the capacity of this larger basin allows it to functionally substitute for four individual handwashing stations, which is why this option is the correct choice. This understanding is essential in plumbing and facility design, as it reflects the practical application of sizing and capacity when designing washroom facilities.