- **Calculating the Remaining School Days**
School days remaining until the holiday can be calculated by first determining how many school days are in a week, and then subtracting the number of weeks left until the holiday.
- **Number of School Days in a Week**
Since school is open 5 days a week, we can calculate the total number of school days in a week by multiplying the number of days school is open by the number of weeks in a week.
\(5 \text{ days/week} \times 1 \text{ week} = 5 \text{ school days/week}\)
- **Number of Weeks Until the Holiday**
Given that the school holiday starts in three weeks, we can calculate the total number of school days remaining until the holiday by multiplying the number of weeks remaining by the number of school days in a week.
\(3 \text{ weeks} \times 5 \text{ school days/week} = 15 \text{ school days remaining until the holiday}\)
Therefore, there are 15 school days left until the holiday starts. This calculation helps students and teachers plan for upcoming assignments, exams, and activities before the holiday break.