At a restaurant, a hamburger costs $0.95, and a chicken sandwich costs $1.60. If 20 more hamburgers than chicken sandwiches were sold in one afternoon, and $103.15 was earned in total, how many hamburgers were sold that afternoon?

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?