The equation that can be used to find out the total time it will take to William to mow the lawn is (75n) / 100=33.
This is a mathematical expression that represents a situation including a value that is not known.
In this case the best equation would be 75n / 100=33 as this is the only one that includes all the factors:
Learn more about equations in: https://brainly.com/question/10413253
#SPJ1