In a 10 m2 ecosystem, there are 60 raccoons. What is the population density of raccoons?

6 per m2

10 per m2

20 per m2

40 per m2

The answer is 6 per m2.

A population density is the number of animals per 1 m2.

So, this problem can be solved by using a proportion:

If 60 raccoons live in 10 m2, how many raccons will live in the 1 m2.

60 raccoons : 10 m2 = x raccoons : 1 m2

60 raccoons : 10 = x raccoons

x raccoons = 6 raccoons

Thus, the population density is 6 raccoons per m2.