Question

If 4/5 of a population of a certain town is considered to be middle class and the population of the town is 2000 how many people are considered middle class

Answer 1

First, you would need to create an equation for this problem.
$\frac{4}{5}$ = $\frac{x}{2,000}$

Next, you would cross multiply. 
5x = 8,000

Now, all you would have to do is isolate the x. To do this, you would divide both sides by 5. 
x = 1,600

1,600 people are considered middle class. 

I hope this helps!