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:
[tex]165-45 = 120[/tex]
Those 120 minutes were distributed in the weekly yoga classes
where each lasted 30 minutes.
[tex]\frac {120} {30} = 4[/tex]
So, 4 week yoga classes were held
ANswer:
4 week yoga classes were held