Explanation:
We have the following expression:
[tex]\frac{1}{x_{}}=\frac{6}{18}[/tex]Where x is the missing value, so we need to make a cross multiplication, so we get:
[tex]\begin{gathered} 1\times18=6\times x \\ 18=6x \end{gathered}[/tex]Then, we divide both sides by 6, so:
[tex]\begin{gathered} \frac{18}{6}=\frac{6x}{6} \\ 3=x \end{gathered}[/tex]Therefore, the answer is 3, so:
[tex]\frac{1}{3}=\frac{6}{18}[/tex]