Question

A team of ecologists is tracking mountain lions throughout California. They count 4543 mountain lions in the entire state. The area of California is​ 423,970 kmsquared2. What is the population density of mountain lions per 250 kmsquared2 in​ California?

Answer 1

For this case we can make the following rule of three:
 4543 -----------> 423970 km ^ 2
 x ----------------> 250 km ^ 2
 Clearing x we have:
 x = (250/423970) * (4543)
 x = 2.678845201
 Answer:
 the population density of mountain lions per 250 kmsquared2 in California is:
 x = 2.678845201
nearest whole numberx = 3