In a 10 m2 ecosystem, there are 40 possums. What is the population density of possums?

02 per m2

04 per m2

010 per m2

040 per m2

The answer is 04 per m2.

This could be solved using a proportion. If 40 possums live in 10 m2, how many possums will live in 1 m2:

40 possums : 10 m2 = x possums : 1 m2

x possums = 40 possums : 10

x possums = 4 possums

So, there will be 4 possums in 1 m2 and the population density is 4 possums per m2.