What is the total number of days in a month that has 30 days?

A month that has 30 days indeed contains exactly 30 days. This includes months such as April, June, September, and November, which all have the same number of days. Understanding the structure of the calendar allows you to recognize that each month is defined by a specific number of days, and for those months with 30 days, the total is straightforward—30.

The choices that mention 28, 29, or 31 refer to the other possibilities available in the calendar, but they do not apply to a month that specifically has 30 days. This clarity helps reinforce an understanding of how the months are categorized based on their day count.