If the last fire drill was on October 23, by which date must the next drill occur on the same shift?

The frequency of fire drills in facilities such as homeless shelters is typically guided by safety regulations. These regulations require that fire drills occur at least once per month. If the last fire drill was conducted on October 23, the next drill must take place no later than November 23, which is exactly one month later.

By this standard, conducting the next drill on November 23 ensures compliance with the regulatory requirement for monthly drills. However, scheduling the drill any later, such as December 1 or December 23, would exceed the allowed time frame of one month since the last drill. Therefore, November 23 is the only date that adheres to the requirement of conducting a drill within the mandated monthly interval.