Yeah, 16 hours a week would be tough to get by on. I was working about 25 hours a week at that amount, but I usually had some money left over at the end of the month, so I could possibly have lived on less. And I live in one of the most expensive regions in the country. I don't even earn that much anymore, now I work only 18 hours a week at about $8.50, and I get by because my boyfriend pays half the living expenses. I'd feel positively rich to be earning $11 an hour and working over 20 hours again.
Back when I was single and in college, I lived on my own and worked two jobs, one paying $10 an hour and another paying $5.15 an hour. It was very, very tight. I managed to do it for a couple years before the tuition went up so much I couldn't afford it--and loans didn't go up along with it, so I was left owing the school more than I could possibly come up with, and had to drop out. Ah well.
But yeah, it can be definitely be done.