Answer
Find out what is the population in that city .
To prove
Formula
[tex]Percentage = \frac{Part\ value\times 100}{Total\ value}[/tex]
As given
In a small city, 18% of the people are voters. If there are 5400 voters .
Here Percentage = 18%
Part value = 5400
Put in the formula
[tex]18 = \frac{5400\times 100}{Total\ value}[/tex]
[tex]Total\ value = \frac{5400\times 100}{18}[/tex]
[tex]Total\ value = \frac{540000}{18}[/tex]
Total value = 30000
Therefore the total population of the city are 30000.