I'm on my phone, trying this. It's a question about how many people are in the air right now. - when I tap on a factor, I can edit the slider, but it doesn't d

I'm on my phone, trying this. It's a question about how many people are in the air right now. - when I tap on a factor, I can edit the slider, but it doesn't do anything. - when I tap another factor, the previous editor stays in place. - how do I choose my factor? - where do I actually do the multiplication? - where do I check my answer? - why do the factors have "grab icons" (the six dots)? Why would I drag one? https://imgur.com/a/QSRBbYR https://imgur.com/a/QSRBbYR Etc.