Not sure if this would actually be the correct place to ask this (perhaps math or physics?).
Say I have some resistance bands (to help doing pull ups).
Green band is marked as being able to assist with 50-100 lbs Purple band is marked as being able to assist with 30-70 lbs
If you were to overlay or “combine” these two bands and use them as one, would it be fair to assume that the strength assistance is just “adding” the two together to get an assist of 80-170 lbs? Or how does that math work, perhaps way more complicated than that?