Answer: 82:18 or 4.55:1
Expl:
The ratio of something describes how many x per y.
Here, we have 82 Board Games sold VS 18 Card Games.
The exact Ratio of BG to CG is 82:18 and when simplified you may find 4.55:1, by dividing 82/18, and checking with 4.55x18=82.
Hope this Helped!