Answer:
![x < 18](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mthx7ott7utv9vavdra1z5ucda0mxevfdt.png)
Explanation:
We are given the following information in the question:
"Citizens less than 18 years old are not allowed to vote"
We define a variable x such that x represents the age of citizens.
We have to write a relationship with the help of an inequality for the ages of citizens who are not allowed to vote.
Citizens less than 18 are not allowed to vote.
So x should be less than 18.
This can be written as:
![x < 18](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mthx7ott7utv9vavdra1z5ucda0mxevfdt.png)
is the required inequality for the ages of citizens who are not allowed to vote.