For this case we have the following equation:
x: Represents the unknown value
[tex]\frac {9} {11} = \frac {x} {22}[/tex]
We clear the variable "x":
We multiply by 22 on both sides:
[tex]x = \frac {9 * 22} {11}\\x = \frac {198} {11}\\x = 18[/tex]
Thus, the unknown value is 18.
Answer:
Option C