justin starts going to a new fitness class his smart watch tracks a total if 72 active minutes in a week if he attended the class 3 times
If Justin attended the fitness class three times in a week, his smart watch tracked a total of 72 active minutes.
This means that on average, Justin spent 72/3 = <<72/3=24>>24 active minutes per class.
Therefore, Justin spent 24 x 7 = <<24*7=168>>168 active minutes in total over the week.