Mark has signed up for 10 subjects. Every weekday, 2 of the 10 subjects are taught. When the semester ended, Mark was issued a new timetable for the next semester. Mark noticed that all of the changes were:

- Geography was on Thursday and now it is on Wednesday.
- Chemistry was on Thursday and now it is on Tuesday.
- Biology was on Friday and now it is on Thursday.
- History was on Tuesday and now it is on Friday.
- Physics was on Wednesday and now it is on Tuesday.
- Math was on \( \boxed{ \begin{matrix} \quad \quad \\ \quad \quad \end{matrix} } \) and now it is on \( \boxed{ \begin{matrix} \quad \quad \\ \quad \quad \end{matrix} } \).

On which day did Mark use to have math class?

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