In order to find the cost of 1 pizza, let's use the following rule of three:
[tex]\begin{gathered} 10\text{ pizzas}\to120 \\ 1\text{ pizza}\to x \\ \\ \frac{10}{1}=\frac{120}{x} \\ 10x=120 \\ x=\frac{120}{10} \\ x=12 \end{gathered}[/tex]So the cost of one pizza is $12.
