Final answer:
The equation that represents the situation is d = 30p. If 10 people work on this job, they will take 300 days to complete it.
Step-by-step explanation:
The equation that represents the situation of one person working alone taking 30 days to paint an apartment is d = 30p. This equation shows that the number of days it takes to complete the work, represented by d, is equal to 30 times the number of people working, represented by p.
If 10 people work on this job, they will take d = 30(10) days to complete it. Simplifying this equation gives d = 300. Therefore, 10 people will take 300 days to complete the job.