Problem 3 (2023 AMC 8)

Wind chill is a measure of how cold people feel when exposed to wind outside. A good estimate for wind chill can be found using this calculation: $\text{wind chill} = \text{air temperature} - 0.7 \times \text{wind speed}$, where temperature is measured in degrees Fahrenheit ($^{\circ}\text{F}$) and the wind speed is measured in miles per hour (mph). Suppose the air temperature is $36^{\circ}\text{F}$ and the wind speed is $18$ mph. Which of the following is closest to the approximate wind chill?