That’s much easier. If you weigh 100kg (220lb) it’s W/(100 + W) = 0.8, and solving for W gives 400.

If you eat 400 kg of wine powder then 80% of your mass will be wine.

This will kill you, and it doesn’t actually matter what powder you choose to eat.

I’ve found my preferences have been creeping up in price again, but only because I’ve found I want an actually physically lightweight laptop, and those have been getting more available, linux-able and capable.

I only need a few hundred dollars worth of computer, and anything more can live on a rack somewhere. I’ll pay more than that for my computer to be light enough I don’t need to think about.