I lived by myself on welfare in the last 12 months of university, and my rent was $175 per week, welfare was $175 per week, and I had $3,000 saved to last the year. So I lived on effectively $100 a week after rent and electricity.
There was a period of time my rent was more than my wage $725/month vs $700. I was subsisting off of unlocking phones for people (who those mostly didn't want to do it themselves or didn't trust themselves), dumpster[1] pizza, and the ~$200 a month extra I was able to make ($20 an unlock) was my utilities and non-dumpster-pizza food money.
[1] Literally, from a dumpster. Most local pizza places aren't run by douchebags and tend to put the leftovers in their own bag/box for the poor to consume. I truly appreciated it (much love to Hot Lips in particular), as Pizza was a luxury way beyond anything I could afford at the time.