For this case we have that the total minutes spent in yoga classes last week was 165.
Subtracting the 45 minutes of the Saturday day we have:
![165-45 = 120](https://img.qammunity.org/2020/formulas/mathematics/middle-school/vy93m6yi8m2citw6z4jtxnxkcvri91521h.png)
Those 120 minutes were distributed in the weekly yoga classes
where each lasted 30 minutes.
![\frac {120} {30} = 4](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mzi1v9n1wapkh71neb00nkvnnkvblqrvrv.png)
So, 4 week yoga classes were held
ANswer:
4 week yoga classes were held