Answer:
20,309 people more people per sq mile.
Explanation:
First step is to calculate the population density of both cities, then we'll be able to answer the question.
We're looking for a number of people per sq mile... so we'll divide the population by the area.
New York City: 8.54 million people on 302.6 sq miles
DensityNYC = 8,540,000 / 302.6 = 28,222 persons/sq mile
Los Angeles: 3.98 million people on 503 sq miles
DensityLA = 3,980,000 / 503 = 7,913 persons/sq mile
Then we do the difference... 28,222 - 7,913 = 20,309 people more people per sq mile.
If we were to make the ratio, we'd get 3.57, 3.57 more people in NYC per sq mile compare to LA.