Finding Population Density

“A forest has 300 squirrels living in an area of 10 square kilometers. What is the population density of the squirrels in squirrels per square kilometer? A farmer counts 150 chickens in a coop that covers an area of 50 square meters. What is the population density of the chickens in chickens per square meter? A park contains 500 trees within an area of 25 hectares. What is the population density of the trees in trees per hectare?”