London is the densest, but the comparison was between the central area of one city and the entire area of another, perhaps even including suburbs beyond the formal city limits of the second. When you're leave out enough detail and just post two numbers, you're apt to make such mistakes while posting and thereby post something meaningless.
One good way to avoid posting meaninglessly is to write meaningful sentences and explain your conclusions/inferences explicitly.
One good way to avoid posting meaninglessly is to write meaningful sentences and explain your conclusions/inferences explicitly.