Baker's dairy has 500 acres of grazing land. if the population density is 4 cows per acre, how many cows graze on the acreage? your 1,500 cows 1,800 cows 2,000 cows 2,300 cows

We know that
Population density is a measurement of population per unit area
so
in this problem
Population density=total cows/total area
solve for total cows
total cows=population density*total area
total cows=4*500> 2000 cows

the answer is
2000 cows

For this case we can solve the problem by making the following rule of three:
 1 acre ------------> 4 cows
 500 acres -------> x
 From here, we clear the value of x.
 We have then:
 
 Calculating the value of x we have:
 
 
 there are 2,000 cows on the acreage